Most of us as grans are not likely to meet a Brad Pitt or George Clooney, nor are most of us superstars either, so what we are looking for is an honest, decent looking bloke, we all have different ideas about that. All the comments about men apply to women, younger photo, economical with the truth, insecure, lonely and lots more.
Having found a likely man online, meet him over a coffee and find out what he is like, trust your instincts, if you like him, phone or message him after a day or two and ask him how he feels.
In my case we got on really well over coffee, he lived locally so I called a friend and had his background confirmed, he had lost his wife recently. So I called him pretending to have a spare theatre at Stratford, that went really well, he has proved to be something of a catch, a really nice guy.