My grandparents once had a book about sex after 60. Not sure I'm familiar with 40 year old men that declare having reached an age that men have stopped having sex. My oldest son was born soon after his father turned 40. Even a vasectomy after baby #3 didn't prevent libido...

I'm sorry that you are both completely incompatible in this situation.

Not sure, that I'd personally be able to cope with that, the rest of my life, but that's me.