EditorialsLeague formats
How much does age matter in a dynasty league?
Age matters enough in a dynasty league to reorder the board, and less than dynasty discourse implies. Repricing the same 12-team PPR league as dynasty rather than redraft is worth about 4.9% in HexValue to players under 24, and about -4.6% to players 30 and over. The full swing across the age range is roughly 9.5 percentage points, which moves players past each other without rewriting the top of the board.
Every figure on this page is HexValue, the cross-position number HexMetrics assigns a player once it knows a league's shape. Two boards are built from the same 553-player pool for the 2026 season, identical except for the one setting under discussion, and the difference is what you see. Both are 12-team leagues. Percentages are suppressed for players below a HexValue of 5, because a ratio against a player worth almost nothing reports the size of the denominator rather than the size of the change.
The curve, and how confident to be about it
Across the top 150 players of the redraft board the age effect is close to monotonic. Younger helps, older hurts, and the interesting part sits between them.
| Age | Mean HexValue change | Players |
|---|---|---|
| Under 24 | +4.9% | 27 |
| 24 to 25 | -0.5% | 43 |
| 26 to 27 | -2.5% | 39 |
| 28 to 29 | -2% | 17 |
| 30 and over | -4.6% | 24 |
The band counts belong beside the percentages, and they are not shaped the way you would guess. The two ends carry the headline and they are thin, 27 players under 24 and 24 at 30 and over, so both figures want holding loosely. But the thinnest band in the table is not either end. It is the 28 to 29 group, at 17, and that one sits in the middle.
The flat middle is still the finding that survives the most scrutiny, and it is the one I hold with the most confidence, because it does not rest on any single band. Between 24 and 29 the format barely distinguishes anybody, across 99 players in three bands that agree with each other. Whatever drives the common preference for a 25-year-old over a 27-year-old, it is not being paid for by anything this model can see.
Why this is smaller than the conversation around it
Dynasty rankings do look dramatically unlike redraft rankings, and it is easy to attribute that to the age curve. I think most of it is something else.
Dynasty boards carry rookies and unproven young players who have no redraft valuation to be compared against. They do not move up the board, they appear on it. Restrict the comparison to players valued in both formats, which is what the table above does, and what is left is a shift rather than a reordering.
The second reason is that age is one input and not the dominant one. A 29-year-old holding a secure role can outrank a 23-year-old without one, in dynasty as in redraft, because the age adjustment multiplies production and opportunity rather than substituting for them, on top of a rating already built from six measured dimensions. A model that let age dominate would be easier to write and would be wrong.
Keeper is not half a dynasty league
A keeper league keeps two or three players rather than an entire roster, so the age curve should apply with less force. HexMetrics prices it that way rather than treating keeper as a softer word for dynasty.
Getting this wrong is not subtle in either direction. A dynasty league read as redraft loses the age curve altogether, which prices a 21-year-old and a 29-year-old identically, and that is a large error to make silently.
On Sleeper none of it needs inferring. The league states it in settings.type, where 0 is redraft, 1 is keeper and 2 is dynasty. Guessing from the presence of taxi slots instead misses every dynasty league that runs none, and there are plenty of those.
What I would actually do with this in a draft
Buy age at the young end and nowhere else. The premium the model pays is 4.9% under 24 and it is gone by 25: the 24 to 25 band sits at negative 0.5%, and the entire run from 24 through 29 fits inside a 2-point range. If you are paying to move from a 27-year-old to a 25-year-old, you are buying about two percent of value. Whether that is a good trade depends on what your league charges for those two years, and two percent is the figure to hold it against.
The 30-and-over discount is the one age adjustment I would act on in the other direction, at negative 4.6%. It is also the band where I am least inclined to argue with the market, since a 4.6% haircut on a player whose next season could be his last looks more like a fair price than a mispricing.
Two limits on how hard to lean. The 28 to 29 band rests on 17 players, which is few enough that I would defend its position inside the flat middle but not its exact figure. And every number here is an adjustment sitting on top of a valuation that already accounts for production and situation, so it is a tilt rather than a ranking. A 23-year-old who is not good does not become good at 4.9%.
The short version, for a startup or a rookie draft: confirm the format first, because a league set to redraft prices a 22-year-old and a 30-year-old identically and the span between those two bands is worth 9.5 points. Then spend the age premium on the under-24 group, take the discount where the market offers it at 30, and stop bidding on the middle.