Opinion on whether maturity is dependent on a persons age

No not true I know many people the are well over 50 and 60 and are nowhere near maturity

I think maturity is not dependent on age.

I think the life choices and experiences you go through all affect your maturity. It all depends on what you've been through, some young people can through a lot and it can substitute what an adult has been through. It never depends on the age, just your experience or what you have been taught.