I've been having a recurrent discussion with a good friend from this site.
He says that single, 30 year old subs are hard to find. Admittedly, I have noticed an age gap but I still believe that he's wrong and they're not as scarce as he thinks.

In an effort of proving him wrong, I'd like to know if this age gap really exists and your thoughts on the subject.

This is NOT an ageism thread, so I ask you, please don't get offended by it.