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You mean time? I can imagine things aging quite easily

Your imagination is limited to what you can conceptualize based off of your experiences, so as you have not experienced a 4th dimension, you are correct

I think I saw Homer Simpson go into a sort of 5th dimension on their show years ago. It was pretty trippy.

you have to go to the 6th dimension to be beyond experience.
the 4th dimension is time and the 5th dimension is a singing group.