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2.1 Oxidative Damage
Oxidative is the combination of a substance with oxygen, let's talking about 20s who experience oxidative stress; fatigue, memory loss, decreased eye sight, headaches and sensitivity to noise. For example, I am student at college who is mostly stress all the time due to responsible of doing homework, attending to work/meetings, make time for friends, and many events that happened at last minute, i am learning to be able to accommodate at different times at 20s years old. -
2.2 Genetic Limits
Genetic limits is an age limits for different species maximum life span. As I think being at 85s is right lifespan age for humans because most of humans have their life fully maximum by 85s. They should be satisfied with their life. Depends on the genetic, some of genetic are different, due to different health reasons that should cause a person to live shorter than others.