I'm the same age as the OP. A while back, I came to the slightly shameful realization that the milf types that I was turning my nose up at, for being too old or saggy, were still young enough to have been my daughters. And the girls that I was having the most fun with, were young enough to have been my granddaughters.
Thankfully I don't have any daughters or granddaughters.
Anyhow, having got over that, I find that the older and uglier I become, the better and easier it gets. The two girls that I now regard as my regulars are both in their early twenties, university educated and fearsomely bright. When I was at uni, I would have fantasized about them from a distance, but considered them so far out of my league that I wouldn't have dared even to approach them.
Nowadays, I'm so much more comfortable in my own skin that I have no such inhibitions, and just relax into each session. The girls know I'm clean, safe, courteous, inventive and have a reasonable working knowledge of a woman's anatomy, and they reciprocate in full. I can even get them into a lovely sweaty pink chest flush, on a really good day. And that's a hard one to fake.
But we all know it's a business for them, a fleeting fantasy for me, and the whole cosy thing could go tits up at any minute. And that's how it must be. And it's OK.