The whole question is moot. It depends on your priorities for what you feel you need before marriage— something which is NOT ALWAYS determined by your “grouping” (something which I’ve never quite gotten; where do I apply to find out what group I’m in?). Sometimes yes, especially with chassidim, but otherwise I’ve known of people from 17-60.
Admittedly, the general population I’m counting (ranging from what OTHER PEOPLE call yeshivish to MO) clustered by 20-28 for girls and 22-32 for boys, but there are always outliers.