Questions for late bloomers?

I just turned 16 last month and I’ve never had it confirmed but I’m very certain I’m a late bloomer. My height height has figured itself out, pretty sure I’ve still got one more growth spurt, but the thing that annoys me is my voice. It’s definitely changed because I absolutely couldn’t stand to listen to any vid of myself like I really really hated it, it’s gotten better, but I’m still not a fan. Do voice changes only happen once and it’s done or can there be multiple like a growth spurt or do they just happen gradually over time? And secondly, if they happen over time when is the average time when it settles down, ik everyone body is different but what is the average age for a late bloomer. Idk if I’m asking this right but if you get what I’m saying and have an answer lemme know.