The body ages, but the mind doesn't ;)
Stereotypes and generalizations can be accurate, but not always. General behavioral and visual characteristics are formulated about people in a region because there is a general applicability for those traits. Not that it's 100%. Not everything fits into generalizations, so although it might be easier and quicker to generalize and sometimes it's accurate, we always have to be mindful that it can be wrong because it can be a "hasty generalization" as the fallacy is called ;)
I think it depends a lot on immediate situation, if there is a feeling of danger possible, judge harshly and move away early. If there is no such immediate threat, get to know people and be surprised how similar we are. We normally judge on meaningless trivialities that indicate close to zero.