Define “liberal” or “conservative”. Then ask yourself if those are the only two valid political categories that represent one’s political philosophy. Then ask yourself if age has any relationship with how one defines any of the terms I mentioned.
Maybe eventually through this sort of reflection you’ll realize that there is zero truth in the supposed maxim you bandy about. Then again, if you honestly think there’s any truth in that tired old turn of phrase, I doubt reflecting is one of your strengths.