At what age do we officially become old? Going by a subjective definition, women admit to feeling “old” significantly later than men do, according to international research published on Monday in the journal Psychology and Aging. “On average, women set the start of old age around two and a half years later,” study author Markus Wettstein from Humboldt University in Berlin told dpa. This may related to the fact that women live longer on average. Another explanation is that women are more stigmatized in old age than men, the psychologist said. Women may therefore be setting a higher bar for old …