Yep bein old bites doesnt it lol. I'm 42 and know exactly what you mean. I'm in college after being laid off last year so I'm surrounded by women young enough to be my daughter 4 days a week. I'm a dirty old man but unfortunately I'm not that dirty!!!
I have instructors younger than me which is a bit off putting.

Outside a dog a book is a mans best friend, inside a dog it's to dark to read.