I think every individual is different though, as are their tolerances for longer term use & impact on joints & muscles. Different sports have different ways of affecting the body, so its not apples for apples when comparing long distance runners to footballers, for example, even though they both run a lot.
One thing that goes in Tielemans favour though is that it's usually players who never had any pace to begin with who can play well into their 30's, even if they started very young.
Don't get me wrong, I agree that mentality is a key element though. Keeping up the elite fitness, the desire to keep pushing even though you know your body doesn't want to, etc.
Someone like Ronaldo has dedicated his body & mind to adaptability & even though he is slower than he once was, he has changed his game to adapt to that. But then there are players like Agbonlahor who once he lost his pace, he became just another very average player.