Politically untested?
I'm old enough to remember when MEN running for US president were always famous politicians on the national level before ascending to the presidency. They wrote books, had famous legislation presented and passed in their name, were nationally noisy and nationally well known. AOC is mostly a northeastern US political celebrity. She has not been tested under political pressure that would threaten her safe candidacy.
According to ropercenter dot com, the only age group to vote for Trump was 45-64 (54%). People over 65 voted 50% for Trump.