hair genetics?

ok... I was looking through pictures and saw that in forth grade my hair was PAST my shoulders! I was stunned lol.. I could never remember having longer hair!

Well, I`ve been through all the threads and posts again hair growing and so on. One of them said about your hair only lives for so many years.. and everyones is different. So if my hair was past my shoulders before.. I should still be able to grow it past my shoulders now.. right? MY hair genetics.. or years... (whatever) would have changed.. right??