Doesn't the level of grandmaster evolve over time - it is essentially a competition between players who are getting better and better? That means you're not as

Doesn't the level of grandmaster evolve over time - it is essentially a competition between players who are getting better and better? That means you're not asking whether a 25 year old can achieve a static goal(e.g. read 50 books), but you're asking them to successfully compete with everyone else, which includes other 25 year olds but with 15+ years of experience.