of the instruments i've played for any amount of time (i'm 19 now):
violin: 6-17...i still pick it up occasionally (well, really pretty rarely)
guitar: 12-present
piano: 8-9 (really only for like 6 months before it started getting in the way of violin)
banjo: just got it 4 days ago, learning the standard rolls and stuff i guess but it's slow progress
i want to play the piano more so i can stay on top of my reading (i've gotten pretty bad at it), and get back to where i have perfect pitch. i should really take guitar lessons because i only took them for a few months, then the rest was self taught. i'd like to learn more jazz guitar and classical guitar, but i never take the time. i always end up playing styles i like instead of forcing myself to try and learn new ones.
i also want to get a mandolin because it's basically a violin, so it would be really easy to learn.