lol, you're a funny person.The science aspects are part of the EXPLANATIONS for why we have GAS.
You are finally admitting there is GAS.
As for money, arguing players are older now (which you finally admit) because of higher pay is rather far-fetched.
Surface speeds: if anything, MORE RUNNING should SHORTEN careers, not make them longer. I.e with fast courts maybe players would have EVEN LONGER careers now.
You completely misunderstand this thread. I am simply showing that GAS has occurred, that is all. The REASONS for GAS are possible multiple, and I'm not saying I know them all. If you are saying there are REASONS for GAS you are correct. There are reasons/explanations for everything.
where did I say that I admit GAS?
just because some highly talented and hard working guys can earn a ton of money by playing tennis, which motivates them to retire later, this doesn't translate into GAS.
A 36 yo Agassi didn't have the motivation of P. Andujar to stay competitive, as 156k USD, minus taxes and other expenses... I guess he can make similar amounts of money easily, so staying touring pro probably wasn't that attractive to him.
While P Andujar probably can't easily make 680k USD by some other legal activities, so he will stay a touring pro as long as he can.
So you have a skewed statistics from both sides, and fail to recognize this, and keep seeing statements that were never done.