Youth is when the youngest serious Presidential candidate is older than you are.
Middle age is when you are in the same age group as the Presidential candidates.
Old age is when the oldest serious Presidential candidate is younger than you are.
My friend Bill Elwell said the candidacy of Bernie Sanders makes him feel young again—or at least middle aged. But for me, at age 79, Sanders will always be one of those radical Baby Boomer New Left college kids.