Supposedly that effect continues, the first third of life feels longer than the last two subjectively (at least I've heard that claimed). Wouldn't surprise me if it's a mixture of processing speed slowing down making things feel like they're moving faster and just the fact that each year is a small percentage of your life. Maybe also less variety day to day as an adult, fewer big changes.
You can test the clock speed thing and there's some evidence for it (ask different aged people to estimate when a minute has passed, stuff like that).
The watched kettle never boils. Kids are impatiently waiting to grow up, to get through their teens so they can drive cars, earn money, live freely. The average school day is a long day at the office. I recall sitting in class day-dreaming about not sitting in class.
Yeah, I’d guess prison time also feels pretty long. Children in modern culture serve a pretty long sentence (depending on how good your parents are I suppose).
I dunno if that test would really get to it. Presumably people have an updating idea of what a minute feel like, unless they stopped interacting with clocks in their teenage years.
You can test the clock speed thing and there's some evidence for it (ask different aged people to estimate when a minute has passed, stuff like that).