The growing-up-fast part weirdly happened between the ages of 15 and 22.
I've been a 90-year-old man since I was 12 years old.
I've had to grow up pretty fast, which is not a good thing.
Smoking ages you quicker than almost anything else.
In specific circumstances the period of aging decline can set in earlier in a particular organ than in the organism as a whole which, in a certain general or theoretical sense, is left a cripple or invalid.
I was born looking older - and I've been aging since I was a teenager.
The war years count double. Things and people not actively in use age twice as fast.
I was maturing in a way that all my friends weren't. How is it that I'm 10, and I look 15, and all my friends don't?