The reality is that BPT is more correct than people give him credit for.
The examples he gave have to do with ones level of responsibility and maturity, not earning potential.
The average 21 year old girl is and almost always will be more responsible and mature than even a 24 year old guy simply because of what she has done been through and accomplished. Yes, the average bachur might be proficient in the first 14 daf of the standard yeshivishe masechtos, learns with hasmada for most of three sedarim a day and might have a reputation as a lamdan, this does not make him responsible, or mature.