Eh, I was young but when I was 23 I knew what I was doing when it came to sex. I hooked up with older people and knew what I was getting into.

There's also a sea of difference between making mistakes and dating the wrong people, and being predated upon. Saying "people in their 20s should not date older people because they're children" does nothing to address the issue that could be better solved by teaching people to recognize uneven power dynamics relationships, because those can exist even between people of the same age. Anything else is Puritan generalization.