I don't know if you guys have noticed but time is relative. We experience it slower as children because one year at 10 is 10% of our lives so it feels so long. When you are 20 it feels shorter but still long at 5% of your life.
Every year you are alive is a year that goes faster. Now at 40 a year feels like a month and 80 it will likely feel like a week. Assuming I live until 80 and with the years feeling progressively faster, it means I might have 10 years going by my childhood perception left to live.
However many years you feel like you have left is mot likely a going to feel like a lot less than they actually are. https://www.huffpost.com/entry/time-perception-aging_l_63973dc2e4b0169d76d92560