20 years is frightening, really, but I have a semi-escape clause because I didn't start watching until 1996.
I was only just getting into Trek at the time, but I'd had some exposure to TOS as my Dad used to watch it. BBC were pretty far behind Sky's schedule, but it still became tradition for me, my friend and his family to watch at 6pm, whichever series was on. So, I got into TNG's seventh, DS9's second and VOY's first seasons all around the same time. And before long as was watching anything and everything.
I was 12, and still at middle school.
Simpler times indeed!