I know literally dozens of people who have run multiple marathons - most decent level amateur type runners (2.50-3.20 pace). Not one of them could achieve times in their 20s that they could in their early-mid 30s. VO2Max is only part of the equation - it just happens to be the one which can be definitively measured quite easily so people focus on it way too much (similar to serve speeds in tennis).
I'm not disagreeing with you in any way that age-related physical decline happens - rather that the various aspects of it have very different life-spans and peaks. Some are affected greatly by prior training or sheer genetic luck (go ask people in Kenya about the one region within Kenya from where many of the greatest long-distance runners come from). A person's lucky (or unlucky) genetics play a far bigger role in their potential for physical performance and how it changes from 25-40 than VO2Max does. The tired old notion that because Federer is 34 he must be declining in endurance is completely unprovable and not backed by empirical examples. If people said his top speed had waned a bit it would be far more defensable based on examples/studies (not to mention would be easier to measure).
Really quick, wozniacki ran 6 minute miles for an entire marathon... if we have more strong athletes start younger im sure average age would become lower in any event.
in triathalons and marathons and iron mans.... the ones who are making it big and winning are older yes, but they also start later in life.
I am in a xc camp every summer to build up conditioning and get better, my coach is a professional triathlete
He didnt start competing and training until he was 22 because he wasnt given the option for it, he ran xc since he was 6 and had sub 15 minute 5k times, but never did anything more because its not easily accessible
If we had athletes start at the same time, we would have younger champions
being the best at anything takes a minimum 10000 of effort assuming youre the most talented naturally gifted person to play
10000 still takes around 6 years to achieve, assuming its the only thing you do
if the youngest winner was 25 right, in what an iron man or something?... that means he had to start training at least at 19,
i agree with the fact that 25-35 shouldnt be very different, but if we use endurance athletes as a comparison it really isnt fair
how many of them have been doing the same thing for 25 years? probably a good amount, but how many of them started earlier than tennis players?
unless we adress the fact that tennis players destroy their bodies at the same pace just sooner than endurance athletes, then we wont be able to really compare the 2
federer has been doing high impact high energy tennis since he was little, endurance is low impact over a long period of time. both types of athletes start at different times in their lives