✔ 最佳答案
If anything, it's better than starting as a kid because you're way more focused when you're 15 and it's something you're choosing to do rather than being forced to by mommy and daddy. I started learning piano at a later age than most "prodigies" (I started at 11 when most kids start at 4 or 5), because it was something I chose to learn rather than being forced to I learned way quicker than other kids. After 2 years of playing, people thought I had been playing for at least 5 years. Now that I've been learning for 7 years, I've made more progress than some people after 10 years. If you're going to commit to it, it won't be hard to become good.
I've also taught myself guitar, and really it's not that hard to sound decent at it, so after 5 years you should be great if you're focused.