Travel is a set of unique experiences that form unique memories. Part of what’s addicting and pleasurable is that it helps slow down the perception of the passage of time, among many other positives.
It’s also self reinforcing in that when you think back, you tend to disproportionately remember travel vs other experiences.
There’s clearly a lot more benefits than that, but it certainly seems like a significant factor.
1 year for a person who lived 50 years is relatively short(2%) compared to someone who lived for only 20 years (5%)
If the 50 year old looks back 5 years, their life probably wasn't all that different. If they look back 15, their kids were still at home and they had a different job title but they were fundamentally the same person, and they feel they've been that way for a very long time.