Well, TimeParadox is absolutely correct- if captainsanta's only reservations on building his own PC is his age, then he should push that misconception aside.
Obviously, if captainsanta doesn't feel comfortable, is disinterested or otherwise does not WANT to build his own PC, then that's his right and his choice.
But realize this- I know a LOT of really tech-savvy youngin's from the ages of 12-19 that can build and work on PC's every bit as good as senior's twice their age. So if age is the only concern, a strapping young 13-year old who is interested in such things... it's a great opportunity. Heck, building plastic models or model airplanes is aimed at the 10-15 age group and snapping together a PC is much easier than that. hehe. No glue, fumes, mess or decals that never seem to stick on straight.
But it's understandable if you're not interested. You CAN save a lot of money, get a better/upgradeable system, learn a TON about the PC itself in a way to be better equipped to handle problems and upgrades down the road.. as well as find it enjoyable if you're into that sort of thing or building stuff.. but unlike plastic models, I wouldn't recommend blowing it up with firecrackers once yer done as it's a bit too pricey for that.