Dating when you're older is harder for everyone, men/women/non binary. Just like changing career is harder when older or making any big life change. There's fewer options, more risks involved and everyone is less flexible. I know plenty of men who are 40-42 who say they're 38 on the bio as they think most women in their 30s have a cut off at 38-39.
But it doesn't mean it's impossible or won't ever happen. It just means you need to be accepting that it takes as long as it takes and not get defeatist/bitter/jaded - all of which will guarantee you won't meet anyone. I know plenty of people who've met partners or even second spouses much later in life, 40s, 50s etc. There's a billions of people in this world and logically you know there has to be at least one person you can click with. So everything is about just maximising those chances. Doing all the things you love, enjoying your life so it attracts good people who want to be a part of it, putting yourself out there sensibly and trying to learn more about others and what they like. I think a lot of people are very unrealistic about what the sort of person they want really wants for themselves.
I personally think most men want someone who makes them happy and allows them to live their best life (whatever that looks like). And so are most likely to go towards what feels good rather than review a woman quite so analytically in terms of fertility etc. All the guys I know or have dated in the past have ended up with women a similar age to them. The only one who went a decade younger got so much flack for it and he admitted he wanted someone who'd just do whatever he wanted, more pliable. He was deeply insecure and no one thought well of him. So the guys who do go much much younger likely have a lot of issues themselves!
As for the daft idea that all the good ones are taken in their mid 20s... No. There's plenty of good ones who are living their 20s being independent, learning to fend for themselves alone, travel, forge a career, buying assets, enjoying hobbies, and sowing their wild oats before settling down in their mid-late 30s. The ones who settled young are the ones likely to have a mid life crisis when they realise they've never really been alone or really know who they are outside a couple. And you'll meet them on their second go post divorce! Anyway we are all living till our 80s - its good to have some time to yourself and date around more.
Dating isn't a competition. There's enough people for everyone. The scarcity theory causes so much damage to people because it makes you feel like you're in a race. Except it's your life and a lot more enjoyable if you think you'll meet someone at some point and whether you have 60 years with them or 40 years - you'll still have had a good life.