On Wiki, we have a list for List of youngest grandmasters since 1950. What about superWGMs (any female player who has reached 2500+ or has become GM, whether or not they were actual WGMs so as to include Judit Polgar) instead of GMs?
Note 1: I use 2500 as the mark for superWGM based on this and this.
Note 2: I'm guessing this is a different question from this (List of records for youngest female grandmasters since 1950?) because you could reach 2500+ without getting the norms right? But eh it's probably the same answer anyway.