What's this sickness called?!

Theres some kind of sickness where a child is only like 7 years old, but thier body functions like an 80 year olds!. They have wrinkles, they need walking sticks, and their bones are weak!. The kids sort of look like a 5 year old, but they also look like a very old person!. I know this is a very rare thing, but can somebody tell me the name of it!?Www@Answer-Health@Com

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