Why is it condescending to state that certain wisdom comes with age?
Of course, I didn't believe this when I was young either.
I agree that zealotry is best avoided.
However, please note that cutting people out of discussion "because this is something you'll learn as you age" is not a great way to convince them of something (which may not be your goal).
You've ignored the majority of what I've said, including everything about how age is not a bright dividing line between the wise and the foolish.
Evidently you want to keep believing what you believe. So, go ahead and do that. I really can't stop you and don't wish to.