I am 19 yrs old, and for me I came to the realization pretty recently, "You'll never grow old but forever young. You may age in the mirror, but the appearance won't matter (I put on Retin A by the way, and sunscreen inside the house too... and I hardly go outside) But anyways, I don't want aging to have any effect on my life and how I live it".
I want to feel like this at 30 years old, and I want to feel like this at 40, 50, and 60 years old. Life is worth living, and the other alternative is dying. Which is not exactly what I want to do, since I don't really believe there's an after life so I hope to enjoy today and tomorrow. But if there is an afterlife then it will be there waiting for me, and I can put that off until another time.
Aging doesn't scare me, but the health effects worries me, but I'll survive.