I've been using off and on for about 15 years, sometimes going years at a time without doing nothing other than cruising a few months a year. Back in 2009 when I was on a few grams of gear (test/deca/drol) I got my girlfriend at the time pregnant, she lost the child in a miscarriage a few months in. I only take TRT now and two years ago I had a sperm count done and it was fine, I'm in my late 30's. My health is great, but i have to watch my blood pressure closely, it may be genetic, but once I hit 35 I had to stay under 220 pounds or my BP got crazy high. So i focus on staying lean year round and don't care about gaining size.
I'm not sure the science behind gear users having girls, but i know 10 years ago or so a forum member on a lot of the private gear forums started polls on the subject and it was almost 70% girls. There has to be something behind it.
The biggest fear you should have of coming off after many years is the emotional rollercoaster. Some guys get it worse than others, but when i came off with PCT after blasting and cruising for about 8 years i was in a very deep depression for about 8 months. It was crazy, i had zero energy, no ambition and no sex drive. I've never had depression before that time and it was a shit show, i lost a job, left my girlfriend and started drinking heavily; just be aware of that as it happens quite often.