I am 21 and I don't feel I look like a true adult at all, neither do the majority of my friends. Guys who are 30 years old in my opinion tend to be the ones who look, act and actually sound more manly then 20 year olds. It seems like our voice of a man comes to us when we are around the 30 year old mark (Generally around mid 30)
For example,
Leonardo Dicaprio
23 years old link
37 years old link
Dwayne Johnson (The Rock)
in his 20's link link
In his 30's link
It looks as though our bodies, hands, arms and faces tend to gain more mass (not necessarily far)
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