Actual answer:

The data shows that from January 2024 to December 2024, 67% of player hours on PC were spent on a game that was six or more years old. A further 25% of player hours were spent on games that were two to five years old, and the remaining 8% of time was spent on games that are less than two years old.

Sample:

The results are extrapolated from a yearly in-depth survey of 73,000 players, alongside data from over 10,000 games