So you have never come across a man that's gossiped. That's bullshit. It's a fact that a man expressing a disagreeing opinion, is accepted. When it's women, it's labelled as bitch, catty, nasty. Women are judged differently. I get it because I may have felt similar at 20. But it's bullshit that men don't gossip or voice different opinions. Often in a nasty way. It's just seen as not lady like, so women have negative labels attached to it.
You do care what men like. Why on earth would that comment have even made sense if you didn't give a shit what men like. Where was it's relevance to the discussion. It was a mysognistic comment designed to shut women down.
Yes, you are speeding up your timeline and doing things earlier, risking your career prospects in the future because of his age. Therefore age does matter and it isn't just a number, as pp said.
Why would you need a pre nup? You will be married then have kids very quickly. In the UK that would pretty much good the pre nup. They are not legally binding in the UK anyway. Marriage for a few years, you taking a hit on your career to have kids, will mean a pre nup is pointless.
Also please don't take the hit on your career to have kids without being married first. That would be a huge mistake and you are more intelligent than that.