According to Vox, there's very little scientific evidence to suggest our perception of time changes as we age. However, people consistently report that the past felt longer.
There are a few different ways to study how we perceive time. Scientists can look at time estimation, for instance: people’s ability to estimate how long an activity took to complete. They can also look at time awareness: the feeling that time "flies" when we are having fun, but then slows to a crawl when we do something boring. Finally, there's time perspective: the sense of a past, present, and future as constructed by our memories.
Researchers have found that time estimation and time awareness do not change much as we age. However, time perspective does. Generally, when people look back on their own life, they feel like their early years went by at a crawl, while their later years go by much more quickly. Childhood is full of big, memorable moments like learning to ride a bike or making first friends. By contrast, adult life becomes ordinary and mechanized.