I'm 28.5 and not an active editor. I made one vid in April of last year and haven't been able to sustain interest in a project since.
If you look at the timeline, I started amvs in 2003, peaked in 2005, died in 2007. Comparing that to my other anime-related hobbies, I see a very interesting connection. I started fanfiction in 2001, I peaked in 2002, I switched to amvs in 2003 and my fanfiction was officially dead by 2004. Then in 2006, when my amvs started dying, my fanfiction started again and peaked in 2007 (by the time my amvs were officially dead). I seem to have a three to four year hobby life before my interest fades and I jump away. If things continue to follow this pattern, I'll be making amvs again by April or May of 2009.
I'm like a field that's constantly being rotated so that it'll yield crops indefinitely. Age doesn't factor into it because each time I start up a hobby (or restart an old hobby), I'm 19 yrs old again, my first year in college, and relishing in finally having access to that mythical internet thing everyone's been talking about for years. Watch out world, I've got an internet connection and I'm not afraid to use it! It's a giddy rejuvenation that works every time. I only feel old when the hobby starts getting dull, when I forget what it was like to do without, and I'm seeking the new again to refresh my appreciation.
I can't relate to the editors who started at 15. When I was 15 we couldn't afford a vcr, let alone a computer.