What are your thoughts on why women are Infantilized only in a relationship age gap?

You commonly see people say "groomed/groomer" when a guy mid 20s to 30s has an 18/19 yr old girlfriend implying that the girl is not yet mature.

A girl that age has enough maturity level to:

• apply for basic jobs
• legally vote
• legally drive with a student license
• legally drink
• have the conscious decision to get pregnant/abort a baby
• post thirst traps/sexualize herself online
• commit a crime and NOT be judged as a minor

And a bunch of other stuff that I didn't get to put here. But all of a sudden, she's not mature or an adult enough to consentually date another adult and now it's an age gap problem?

Gotta stick to a lane here: either she's an adult or she's not.