Pretty sure in the post-lockout era NHL ('06 on) goalies have always been that later twenties to early thirties for hitting their stride.
Some of the biggest names in the league are all within that parameter:
Georgiev - 27
Saros - 28
Demko - 28
Sorokin - 28
Shesterkin - 28
Vasilevksy -29
Though, going over that list I linked, it does look like there's a pretty even spread for age brackets for starters in the NHL.
However, Oettinger, Skinner, and Swayman are the only guys 25 and younger that have made an impact over a few seasons. There's some other good goalies getting starts in that age bracket, but the above three have been around the league for a while now that you forget they're not essentially kids.