24 years old here.
I don't "worry" about my age, but I do LOVE being young, and understand all of the wonderful things that go along with it. Having just recently finished college, I already realize how many of the things I will NEVER experience again, even though it was just a matter of months ago. I understand there will be many amazing things yet to be experienced in life, but the fact that so many indescribable experiences are forever changed and / or will never be the same does sadden me a bit . . . or make me nostalgic at minimum.
I'm excited about the future, but am sooo thankful for my past. I always have my music to bring me back to those times, and no one can take that from me!