It depends. Some players are washed-out has-beens at 25 for one reason or another. It might be due to being injury plagued in some cases, or perhaps not investing enough time in their health and fitness in others. George Best being the ultimate example. I saw a podcast involving Asafa Powell and Noah Lyles with the latter maintaining that some guys have one or two great seasons and then don't spend enough time on their health and fitness levels so their performance plummets. Grealish for example, although playing well for Everton, might have had a more productive time at Manchester City had he cut out the partying and invested time in maintaining his fitness. And he's two years younger than Kane!!you know Kane is only 32? Not exactly old for a player even 20 years ago