Nowadays prime athletes are able to compete until they are 35+, Messi won the world cup at 35, and Ronaldo was hammering in 20+ goals at 35. The best of the best, if they keep fit, can go all the way.
AO, Wimby and FO have all had clear favourites winning, but the US Open is by far the most random tournament of all GS. The last few winners are Alcaraz, Medvedev, Thiem