Why does age matter in a fight?

Say if a 21 year old had to defend themselves against a 30 year old or ages older. Why can't a 21 year old beat or be just as strong to handle them? If thats the case what age is a young man able to handle a older man in a fight? I don't understand why the human body operates like that.... I just think... show more Say if a 21 year old had to defend themselves against a 30 year old or ages older. Why can't a 21 year old beat or be just as strong to handle them? If thats the case what age is a young man able to handle a older man in a fight? I don't understand why the human body operates like that.... I just think it's pure stupid!? Why can't we exceed our limits?Is there away to make you body develop faster or be stronger then a older persons?
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