Came too fast and I wasn't ready

Or NASCAR drivers.

Am 13, can’t relate.

Expendables.

Gandalf can still come to your door at age 50

Don't worry. You'll quickly realize that you actually don't want to if you think about it. You are now the wise "mentor" character or football coach. You get paid the same but have less lines, don't have to get roughed up, and can let the kids get sweaty and go through hell while you chuckle in safety enjoying a comfy seat and a good drink.

Pop singers

Now my goal is to become every character played by Maggie Smith.

Theres always 'Cocoon'