Got my Grade 8 Distinction for piano a few years ago when I was 14, and that was the last exam I did, even though my biggest improvement I made was between then and now.
Started guitar when I was 14 as well and got to the stage where I could almost comfortably play to the standard of the Under a Glass Moon solo... i could alt. pick runs in sextuplets at 160bpm... but its not all about technique lol
they're the only 2 instruments i consider myself half-decent at, but I had a go at cello a few years ago.
But all this was before my index finger screwed itself up, which happened about 6 months ago :(