I'm nearly 20 FWIW but it honestly doesn't matter, once you're over 18, age is just a number. Jeeping is only a weekend hobby I do now, and even then I don't really get out and hit up the trails (which is a better use of my time than getting fat sitting in front of my computer), aside from it being my daily driver..
I can finish the supports in a couple of weekends. i'm not doing it because I have other things to do that get in the way (work, family, social life, ect.). I can't stand a wooden coaster that was just sloppily tossed together with auto supports. It's a horrible and vile method of adding supports to your wooden coaster, and I always dock down points for it. We always judge supports for steel rides- how realistic they look, how well they were built, ect. but when it comes to wooden coasters supports just aren't cared for? Makes perfect sense to me.
I'm backing out of this one because I don't have time to fuss with creating a wooden track. It's time consuming to get the proper flow and feel to it. What little free time I have I'd rather spend OFF my computer and not sulking up in back pain or headaches.