As others have said, FB, it's not a problem. I am like you. 50+. Still got plenty of oomph. Don't think I look like an old bloke, and have all my hair still. Turn up well groomed, showered, and sometimes with a bottle of something or other.
Been going through a phase of being very into short, dirty-blonde, twentysomething girls, and not once has the age gap been remotely an issue. I've seen the odd AW profile that says 'no over 50s' or some such thing. But I wouldn't be interested in any tart who said that.