I think long periods of time are experienced logarithmically, with a base of around 2. So the period from, say, 10 to 20 years is comparable to the period from

I think long periods of time are experienced logarithmically, with a base of around 2. So the period from, say, 10 to 20 years is comparable to the period from 20 to 40 years, and then 40 to 80 years. The seasons really start to zoom by at my age. (I'm in my late 50's.)