The age curve: when a footballer's value really peaks

Of all the inputs into a player's value, age is the one that does the most work while drawing the least attention. Talent and output set the level; age sets the direction. The relationship isn't a straight line but an inverted U: value climbs through a player's development years, plateaus across a prime window, then declines as the runway shortens. Almost every serious valuation framework, from academic models to club recruitment desks, is built on some version of that curve.

The peak isn't in the same place for everyone. Goalkeepers age slowest and often hold value deep into their thirties; centre-backs and deep midfielders rely on reading the game and decline gently; forwards and wide players, who live on acceleration, tend to peak earlier and fall away faster once that first yard goes. A 29-year-old striker and a 29-year-old goalkeeper are at very different points on their own curves, and a value that ignores position is missing half the story.

This is why a proven young player commands such a premium. He offers two things an established star can't: the upside that his level may still rise, and resale runway — years of prime ahead in which a buying club can recoup or profit. The market knows this, which is why teenagers with a season of real output behind them are priced as though the best is still to come. The risk, of course, is that potential is a projection, and projections are wrong often enough to keep the discounts honest.

At the other end, the market can be slow to mark a famous name down. Reputation lingers after the legs have gone, and a player's value can sit above what his current trajectory justifies simply because he was once worth more. That lag is one of the most reliable sources of overvaluation in football — and one of the easiest to see once you separate what a player has been from what he is now.

FootVal handles all of this through a single, deliberately bounded factor. Each position is centred on its own typical prime, and the model adds a development premium for genuinely proven youth and a depreciation discount past peak. Crucially, it's a nudge, not a re-pricing: age can shade a value up or down within sensible limits, but it can't conjure a €200m teenager from a €20m base or erase a great player overnight. The aim is to respect the curve without being a slave to it.

The takeaway for anyone reading values is simple: always read a number next to a birthday. The same output is worth more in a 21-year-old than a 31-year-old, not because the older player is suddenly bad, but because you're buying fewer prime years and less upside. Once you see value through the age curve, a lot of football's pricing — the wonderkid premiums, the bargain veterans, the deals that looked mad and the ones that aged badly — starts to make sense.