It's the same reasoning as why insurance gives better deals to people of greater age.. They are seen to have more experience and be more "mature " to drive safer if you have more years driving your insurance goes down.. same concept
It could be D or C I believe
8 hours of sleep each night every day for the next 100 years.
Hypodermis because of the melanin
f a neighborhood has nothing to do with a person from growing up and how they would turn out in the future