I must be getting older

As a child, I was indoctrinated with the idea that time would continue to speed up with each passing year. We all know that this is not the case, yet on a day to day basis I find myself comiserating with my customers on how quickly Fall has gone by this year.
It is well known that time moves faster in the eyes of adults than in the eyes of children. What is it that creates this illusion?
Size perhaps- adults are closer to the clock hung high on the wall, so it appears to move at a quicker pace... doubtful.
'Adults are busier.' I don't know - as a kid going to school, I got up at least an hour earlier than I do now, I walked to school, did home work and chores, and played relentlessly until bedtime... my "schedule" was quite full.
As a child I long awaited the adult stuff in life- getting to drive, not having to go to school, living on your own, etc., etc. Now I would give anything to go back to the carefree life of just being a kid. So anyhow, this time going to quickly thing must be wrapped up in the cares and responsibilies aspect of adult life. My question now is how can we adults get back a child's perspective of time without failing to fulfill our work and family related responsibilites?
Is it possible? Or maybe I am rambling endlessly because I've lost my mind- another sign of getting old..........