When you're 5 and add a year to your life, that's 20% of your whole existence, a huge chunk!
When you're 50 and add a year to your life, that's 2% of your whole existence...Not really all that much.
Time becomes less significant as you get older.
Discussion
Interesting point pf view, because I feel it exactly the opposite way. As a boy, I had endless time at hand, while now as an adult I have to make every minute count because there‘s so much I want to do and I feel like there‘s so little time available.