I once heard a quote from an old woman: Young people worry about reaching old age. They shouldn’t worry. It doesn’t last that long.
And I can attest to that. I’m 71 and I swear Christmases flash by as fast as weekends used to.
Oddly, though, individual days seem to last as long as they always did.
I think it is a byproduct of failing memory. I used to remember everything like a long tunnel when looking back on a year. Now, it's a pretty short tunnel.
One thing I've heard that makes a lot of sense to me is that the reason time seems to go faster as we grow older is because when we are young, we are always experiencing new things. Almost every day is a wonder of discovery and we build a lot of fresh memories. As we get older, however, have less and less new experiences and thus less new memories to fill our thoughts, sometimes just the mundane daily experiences that leave no lasting impression and seem more empty. The remedy to that, of course, would to try and make our days more meaningful in the sense of having as many new experiences as we can for as long as we can.