Perhaps I'm just lucky, but I've never felt any need for an in-flight
relief system. Is this urge to go something most pilots are subject to,
or just a sub-set? Or is it something I can look forward to?

I'm not trying to start anything, I'd just like to know if there are
others like me. For the record, I'm 58, I'll drink up to 48 ounces of
water during flights, I've been airborne up to 6 hours, and I fly in
eastern Pennsylvania.

-John