Resistance of authority, in the most basic and societally deterministic of terms, is related to how well you are socialized for a particular facet of a particular society. We are constantly having forces exerted on us, attempting to, and generally at least partially succeeding in, shaping our actions and perceptions. Reasoning along this line, with age, assuming you have been fairly stable in your social confines, these forces would likely increase your obedience with society. Hence, age could be a definite factor.
Personality is also a factor. There are parts of our personality that are nigh unchangeable, and if those parts of your personality happen to clash with certain aspects of dominant society, then resistance to authority will be a result. Personality is also a result, at least in a large part, of the formerly noted socializing forces, and therefore when you age, your personality tends to change. Thus, the two "causes" that you stated are inseparable.
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"Few people are capable of expressing with equanimity opinions which differ from the prejudices of their social environment. Most people are even incapable of forming such opinions." - Albert Einstein
"Wise men talk because they have something to say; fools, because they have to say something." - Plato
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