New places, new things, new people, new routines all reset the clock.

Subjectively it felt like I lived about 5 years in the first 2 months after my first kid was born - certainly they were more memorable than the previous 5 years. We were basically confined to the apartment except for doctor's visits during that time period, but the experience of caring for a little person was dramatically different from everything that came before. And then the newborn periods of our 2nd and 3rd kids flew by, because we had all the routines down.

2020 also felt like I lived a lifetime in a year, even though we were shut-in, because of all the events and changes of routine that year.