Growing up I played in garage bands and cover bands with my older brother, and he got us a gig opening up for some hippie jam band. I was 15. I felt like such an adult!
Be ready for when your time comes, you will have that window of opportunity, so seize the moment and capitalise on it.
Just look at my face. Its an extraordinary experience. All of my friends who are grandparents have been saying, just wait, a bit cynically, but its just extraordinary. You feel like a child again yourself. Just walking on air.