This is a pretty interesting site. It tells you if anyone in MLB is older than you, and if not, lists the last player to play in the Major leagues that was older than you when they played.
They also list the first player in the major leagues to be younger than you. So for instance Adrian Beltre debuted when he was 19 in 1998 making him the first player younger than me at the time. Bartolo Colon is the oldest player older than me playing.
https://enlightenment.rip/who-are-your-mlb-endcaps/
