If in the first year of life, you have 100% new experiences, 2nd year, 50% new experiences, etc, and reach an age of around 80, you'll have made half your life's experiences by the age of 20.
I think in retrospect we perceive time through our memories, less so by our momentary experience. If your memories have little variance, you'll feel like time has passed quickly. So if you work some factory job for 40 years, you may feel like life passed by in a blink of a moment.
I think in retrospect we perceive time through our memories, less so by our momentary experience. If your memories have little variance, you'll feel like time has passed quickly. So if you work some factory job for 40 years, you may feel like life passed by in a blink of a moment.