In the uk where I am most lower class people lose their virginity between 13-16. I remember being ridiculed for being a virgin at 17. The age of consent is 16 and losing your v card after that mark is a sign of major uncoolness and loser status, there was a mad rush for people to get a fuck before they turned 16, so all these 15 year olds were hooking up and losing it so as not to still be virgin past the aoc deadline.
There was an actual weird sort of witch hunt in my year to determine who was still a virgin past 16. Chav scum would crowd around a suspected virgin and start questioning him about his sexual history, if he admitted it, they would all laugh and push the person and chant and sing a stupid song about it; it was preposterous. It happened to me lol.
Genteel middle class people probably lose it between 16-19 imo and obviously wouldnt engage in boorish behaviour like the underclass do about virgins, and they wouldnt overtly judge someone, just spout some bluepilled gibberish.