Yes of course you can, I'm 15 and I started playing guitar when I was 13, it's a lot of fun, but it takes a lot of practice xD you should try it it's a good skill. You should also learn to read guitar tab :D
Yes why not, as I am a music teacher on guitar and teaching guitar at Boulder Guitar Coach to the kids who are 12 to above years old. If you need any basic tips on guitar playing you may visit our site boulderguitarcoach.com.
