I do wonder whether an older man would prefer an attractive, slim 40yr old, or an unattractive, overweight 25 yr old.
Generally they'd prefer neither.
Most of the middle aged blokes I know are acutely aware of their receding hair line and growing waistband and are pretty self depreciating about it. There are a few hyper fit exceptions but the idea that most blokes of that age are checking themselves out in the mirror each morning and thinking "yep, I've still got it" is laughable.
About 12 years ago, when I was in my 30s, I tried online dating. I was slim but curvy, great figure, pretty face, amazing hair. Men my own age ignored me. I had some interest from younger men. Mainly the messages were from men in their 40s/ 50s/ 60s. Very few were remotely attractive. Most were greying, balding, overweight and just generally hadn't taken care of their physical appearance. And yet all, for some reason, thought I might be interested. I'm not sure if they thought they were actually attractive, or thought I'd be so desperate to settle down that I'd take them anyway.
Back then OK Cupid used to write blogs using stats about service users. Not sure if they still do. They found that whilst women were prepared to date either side of their own age, men consistently set age ranges from their age down. Not only that but when it actually came to who they messaged, they ignored women their own age, even if they stated an interest, and just went for younger women. Not all of them of course, but that was the general trend.
I gave up on OLD. Tried again in my mid 40s and it was very similar. Then met someone down the pub - friend of a friend.
And for whoever it was who said online dating is scraping the barrel - both me and my OH have tried it, it just happens not to be how we met. Many, many people use OLD. It just highlights the fact that there are a lot of people you wouldn't want to date, and a few you might.