8 XXX : normalnudes

Don't worry. We all will get very old. Some people unfortunately cant. So you should be thankful to be alive and stop worrying about things you cannot control.
Too old for what?
Better to worry about dying young, lol. Getting old is great, honestly. I was, like you, worried about it when young, probably felt older at 30 than I do now at >50. Eventually we all look like monkeys I guess but I am quite surprised and pleased to have gotten so many good years! Honestly you also do have a body type that will likely age beautifully if you take care of it. You are built pretty lean. Hang in there, you will see, it gets better.
I used to post on a lot of subreddits when I was 18 but as I've been getting older more and more of them are kicking me out for being too old. I worry sometimes that men are only into "the teen look" these days.
You're less than three years past being legal, I don't think you have to worry about being old yet :P