Two catalogs can share the same last-twelve-months earnings and carry very different risk profiles. Dollar Age is the metric that captures that difference. One may derive most of its income from tracks released two years ago, still in the steep phase of the royalty decay curve, with earnings that could fall 20% or more next year. The other may draw the same total from tracks that have been earning steadily for a decade: mature, predictable, annuity-like.
The Dollar Age Formula
Dollar Age is the earnings-weighted average age of the tracks in a catalog:
Dollar Age
Dollar Age = Σ (Track LTM earnings × Track age in years) / Total catalog LTM earnings
The earnings weighting is what makes the metric useful. A catalog with 500 tracks mostly released in the last two years, but one dominant 15-year-old track earning 60% of the income, will have a high Dollar Age because the earnings are old even if most of the tracks are not. Conversely, a catalog with 20 old tracks dominated by income from a single recent viral hit will have a low Dollar Age despite its apparent vintage.
The logic mirrors the Lindy Effect applied to royalty earnings: the longer a track has been generating meaningful income, the more likely it is to continue doing so.
Dollar Age: Worked Example
| Track | Release year | Age (yrs) | LTM earnings | Weighted value |
|---|---|---|---|---|
| A | 2008 | 17 | $18,000 | 306,000 |
| B | 2015 | 10 | $9,500 | 95,000 |
| C | 2019 | 6 | $6,200 | 37,200 |
| D | 2021 | 4 | $4,800 | 19,200 |
| E | 2023 | 2 | $3,100 | 6,200 |
| F | 2024 | 1 | $1,400 | 1,400 |
| Total | $43,000 | 465,000 |
Dollar Age = 465,000 / 43,000 = 10.8
Despite containing two recently released tracks, this catalog's Dollar Age is 10.8. Track A alone (42% of LTM, 17 years old) pulls the average significantly upward. That is the earnings-weighted mechanism at work: a single mature, high-earning track has more influence than three younger, lower-earning tracks combined.
What Dollar Age Tells You About Catalog Risk
Dollar Age maps directly onto the decay curve. Higher Dollar Age means the earnings base has passed through its steepest decline and is sitting in or near the stable tail.
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Below 3 years: Steep decay phase. Earnings are likely still declining sharply. Forecast confidence is low; wide intervals required.
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3 to 5 years: Decay flattening. Rate of decline slowing but stabilization not yet confirmed. Moderate confidence.
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5 to 7 years: Approaching the tail. Mostly stable. DCF projections become more reliable.
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Above 7 years: Stable tail. Predictable, annuity-like behavior. Narrow confidence intervals justified.
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Above 10 years: Evergreen. The catalog has proven it can hold an audience across multiple music cycles. Buyers pay up for that.
Dollar Age also informs baseline methodology: for catalogs with Dollar Age of 10 or more, a three-year average is generally more reliable than LTM alone because the stabilized earnings warrant a smoothed starting point.
Dollar Age and Multiples
In practice, Dollar Age and LTM multiples tend to move together: higher Dollar Age catalogs command higher multiples because buyers are paying for earnings predictability. When they diverge (a high multiple on a low Dollar Age catalog, or a low multiple on a high Dollar Age catalog), it is worth investigating. Usually the explanation is a specific factor, sync upside, active management potential, or a concentration risk, that the headline multiple does not capture.
A catalog trading at 12x LTM with a Dollar Age of 9 is a fundamentally different proposition from one at 12x with a Dollar Age of 2.5. At 12x with a Dollar Age of 2.5, you are betting on stabilization that has not happened yet.
What Dollar Age Does Not Tell You
Dollar Age tells you about earnings stability. It does not tell you whether the catalog is cheap or expensive.
Source composition. A high Dollar Age catalog dominated by sync income is far more volatile than one dominated by streaming, despite identical Dollar Age figures. Age-weighted maturity and income reliability are different things — Dollar Age only measures the first.
Concentration risk. A catalog earning 80% of its LTM from a single track, even a 15-year-old one, has a Dollar Age that reflects the maturity of that one asset. The perceived stability is misleading if the portfolio's resilience depends on a single work.
Copyright expiry. A very high Dollar Age catalog whose dominant tracks are approaching copyright expiry in a key territory carries a structural risk that Dollar Age does not capture.
Used on its own, Dollar Age will mislead you on all three of these. Pair it with the three-year decay rate (to see which direction earnings are moving) and a sales type breakdown (to see how reliable that income actually is).
Dollar Age vs. Simple Average Track Age
A common shortcut is to estimate catalog maturity using simple average age: total track ages divided by number of tracks. This is unreliable for two reasons.
First, it gives equal weight to dormant tracks. A catalog with 200 legacy tracks each earning $10 per year and 5 active modern hits each earning $50,000 will have a high simple average age driven by the dormant tracks. Dollar Age correctly reflects the earnings profile of the five active tracks.
Second, the distribution matters. Two catalogs with identical simple average ages can have very different earnings compositions: one anchored by a few old high-earners, another with uniformly mid-aged tracks. Dollar Age captures that difference.
Simple average age should not substitute for Dollar Age in any analysis that depends on earnings stability assessment.
Dollar Age at the Portfolio Level
For investors managing multiple catalogs, Dollar Age can be calculated across the entire portfolio using the same formula: each track across all assets weighted by its contribution to total portfolio LTM earnings. The result tells you where the aggregate earnings base sits on the decay curve, which is a more useful number than any individual catalog in isolation.
A portfolio actively acquiring younger catalogs will see its portfolio Dollar Age decline over time even as individual assets age, because new acquisitions with low Dollar Age dilute the stable base. Tracking portfolio Dollar Age over consecutive periods is a useful diagnostic for drift in aggregate risk.
Cohort analysis, grouping assets by acquisition year, reveals whether decay assumptions made at acquisition are proving accurate. A 2021 cohort modeled on stabilization assumptions should by now show Dollar Age values consistent with those assumptions. If not, the underlying decay model may need recalibration.
Data Requirements for Dollar Age Calculation
Dollar Age requires track-level LTM earnings (not catalog-level aggregates), resolved and deduplicated track identifiers, and confirmed release dates (or first-collection dates where available). Without these, the calculation can be performed but the result should not be trusted. The data checklist article covers the specific thresholds: above 90% resolution by earnings weight is the minimum for a reliable Dollar Age figure.
Frequently Asked Questions
What is Dollar Age in music catalog valuation?
Dollar Age is an earnings-weighted average age metric used to assess earnings stability in music catalog valuation. It tells you whether a catalog’s income is coming from mature, stable tracks or from recent releases still in the steep phase of their decay curve. Two catalogs with identical LTM earnings can have very different risk profiles depending on their Dollar Age: a low Dollar Age signals earnings that may still be declining sharply, while a high Dollar Age signals a stable, annuity-like income base.
How is Dollar Age calculated?
Dollar Age is calculated as the sum of each track’s LTM earnings multiplied by its age in years, divided by total catalog LTM earnings: Dollar Age = Σ (Track LTM earnings × Track age in years) / Total catalog LTM earnings. The earnings weighting is critical, it means a single dominant older track will pull Dollar Age up significantly, while many small younger tracks have limited effect. The calculation requires track-level LTM earnings, confirmed release dates, and resolved track identifiers. Above 90% resolution by earnings weight is the minimum threshold for a reliable result.
What is a good Dollar Age for a music catalog?
Above 7 years is where earnings generally stabilize; predictable, with narrow forecast confidence intervals. Above 10 years means the catalog has held its audience across multiple music cycles; buyers pay higher multiples for that. Below 3 years the earnings are likely still declining sharply, which means wide projection intervals and conservative assumptions are required. That said, "good" depends on what you are buying for. A passive income buyer wants high Dollar Age. An active management buyer may deliberately target low Dollar Age catalogs where there is room to grow earnings through sync placements, distribution renegotiations, or registration gap fixes.
How does Dollar Age relate to the DCF model?
Dollar Age feeds into the DCF model in two ways. First, it informs baseline methodology: for catalogs with Dollar Age of 10 or more, a three-year average earnings baseline is more reliable than LTM alone, because stabilized earnings warrant a smoothed starting point. Second, it determines where on the decay curve the catalog sits, which affects the shape and confidence of the forward projections. A low Dollar Age catalog requires wider projection intervals and more conservative assumptions; a high Dollar Age catalog supports tighter, more predictable cash flow modeling.