I have a neighbour who shares our hallway. 'Bob' is 73.
I rarely see Bob due to work and him being with family so don't have a close relationship at all with him. Bob is fit and active, still works part time and has family who live locally so he's not making conversation because he is lonely or such.
When I do see Bob he regular makes comments about sex. Meh I'm not a fuddy duddy but...
Gems have been
'haven't you had a man since your ex, if you haven't it is unfair. We aren't all the same, If I was with you I would just want someone to cuddle in front of the TV with and have a fumble around on the bed but sex would be good too 
)
If I was with you then I would want to keep our own flats and I wouldn't bother you it would be good if we could still have a fumble.
And various degrees about me and him having sex and how we would maintain the relationship ...
He also texts me to say I've heard you come in come round for a coffee etc as soon as I walk through the door.
Aibu to think you don't discuss scenarios of how you would have sex with your neighbour who had shown no signs of any interest!
The kids are teens and have overheard some of this and think it is hilarious and refer to him as my boyfriend little buggers 