We experience time slower when you are younger and faster when you are older. Why?
We think this is because you are more impatient when you are younger and more patient when you are older
It's all perception, true. Time actually goes by at the same rate for all of us, but our current situations and experiences have different effects on us.
I heard a fun description once: Time is like a roll of paper towels -- the older you get, the faster it goes!