How old were you when you had your final sex?

I'm 53 and single and while the dating scene has been rapidly declining as my invisibility to the world increased, recently it has completely dropped away.

Nothing from the plethora of OLD's and despite my best efforts in going out alone and trying new events, I am like a ghost passing through a world that is having fun without me.

I'm at the stage of wondering if I'll ever have sex again or if the next one will be the very last one. So when was you last one either from you consciously deciding no more or the World deciding for you?