It started happening sometime in my late 40's. That is, you get comfortable and just when you are in that right possession - you have to pee.
It seems the older I get the more I have to pee. I think I know why though. I figure the bladder shrinks with time. After all when I was 17 I would stand there draining for what seemed like five minutes in a row.
Now I go every 45 minutes instead of every 5 hours and I am only there for 50 seconds. It makes me thing, if I make it to 80 how many times a day will I have to go to the can and how short a time will it take?
Sex on the other hand takes longer as you get older and some days you fall asleep while the other person is getting ready. But that is another story...