Well, responding to the thread's first post, I didn't switch to bass, I added it to the arsenal. I was 13 years old, going into grade 8 on the first day of school, not knowing anything about what to expect. I had been a classical violinist since I was 4 and pianist since I was 1 (according to my mum who taught me piano and theory). My elementary school let me play violin in the (boring) band.
My high school had no use for classical string players, stupidly, considering how competitive the high school was in music programs country-wide. Whatever, anyway so my big brother who had just graduated from the same high school said I should pick up another instrument, it would be relatively easy for me and I'd be able to use my talent in music and have fun with the other kids. I said "ok, I want to learn DRUMS!'. That didn't go over well with my mum and my brother politely guided me away from that route (by the way I do play drums now as well LoL, although definitely more in the sucky skill range than my bass playing). So I said "electric guitar" and my brother said that in high school band electric guitar doesn't get the same amount of use and in jazz band it's boring (his words, he was right of course, although again I took up electric guitar at age 16 finally as well), and so he said I should play bass guitar. I said "bass" guitar, not having a clue what the instrument was. He assured me it's an electric guitar that plays in the bass range and I could play it in concert band AND jazz band and it's way more fun and there's improvising all the time and the parts are far more demanding and important than guitar parts in high school bands.
Of course he was right

. I went to my first day in high school, told the music teacher who my big brother was (just graduated remember so they knew each other), and said I wanted to play bass. He was happy since there was no other bassist in grade 8 that had registered, so off to the first jazz band class I went, different teacher, and I just knew to take a bass with me from the music office. Looked in cases, saw somethign looking like an electric guitar, brought it with me, was assured when I got there that it was actually someone's priceless electric guitar and that I needed one of the "rectangular cases" (school's fender basses LoL, I didn't htink a rectangular case looked like it held a guitar of any kind so I skipped them my first time through the office). Got the right instrument, went to rehearsal, had never played a bass before, didn't even know what notes it was tuned to (fortunately it was in tune already), sat down and sight read grade 8 jazz bass parts by working it out by ear, knowing how to read music already, and making a HELL OF A LOT OF GUESSES about the keys, sharps, flats, names of notes and so on. for the first 3 months I don't think I knew what note names I was playing at all, I kept thinking of them as the treble clef equivalents from playing violin so long LoL. But I could play just fine thanks to my musical training/experience, and I guess just a natural gift for the bass.
So I became a pretty serious (as in dedicated to working hard on the instrument) bassist then.
A little different from the trumpet players etc that actually had to learn how to make a sound and for whom fingering and their mouths took years to learn/develop.
It's a little different coming from a violinist background, made it much easier.
From then on for years I was on a path to find out how much I could do on a bass that most people figured required an electric guitar or hammond organ for. With effects and just lots of experimenting with harmonics and mostly just getting better at playing/bending notes, I got to where I still am today, in search of a way to put together a band that has one other musician playing something like a stick or something unusual like that, and a drummer, to form a JPJ-thunderthief-like power trio. PS - my big bro also told me back in high school that I should learn to play the stick, it's like bass and guitar at the same time he said, but I never saw the frickin instrument in any stores so it never happened.)
but dammit all anyway JPJ did it first. I procrastinate too much, but I'm still going ot do it, although I'll be called a copy cat when I do finally get it out the door LoL. PS - I'm 40 now. ;-)
But then I'm sure 50% of the bassists on here have had the same idea their whole lives

, so the race is on to see who can do the first JPJ copycat album!
LoL
cheers