The elderly don't drive that badly; they're just the only ones with time to do the speed limit.

The quip flips a common stereotype—“older drivers are bad drivers”—into a critique of everyone else’s impatience. By suggesting that seniors are merely the only people with enough time to obey the posted limit, the line implies that what gets labeled as incompetence is often just lawful, unhurried behavior that clashes with a culture of rushing. The humor comes from reframing “bad driving” as a social perception problem: the norm on many roads is to exceed the limit, so the person who follows the rules appears obstructive. It also hints at generational differences in risk tolerance and daily scheduling pressures.