My daughter says time is passing too slowly, but the little one I remember has already grown into a young adult. To me, time feels like it’s flying by. The longest decade in life is the first one, even if three years of it are lost to memory. The second longest is the second decade. After that, every decade seems to speed up. A young brain has lots of storage but little information. An old brain has limited storage but is packed with information. Five years ago, I proposed a theory: If human memory remains constant at 1 unit per year, then in the first year, 1 unit is 100%. In the second year, 1 unit is 50%. In the third year, 1 unit is 33%. In the fourth year, 1 unit is 25%. By the 10th year, 1 unit is 10%. By the 20th year, 1 unit is 5%. By the 30th year, 1 unit is 3.3%. By the 50th year, 1 unit is 2%. By the 100th year, 1 unit is 1%. So, based on how our memory perceives time: At 30 years old, time feels 3x faster than at 10. At 50 years old, time feels 1.65x faster than at 30. If you’re lucky enough to live to 100, the last year of your life will feel 10x faster than when you were 10, and 100x faster than when you were 1-3 years old. Around 10 years old, that’s my child. Around 30 years old, that’s me. In their 50s, that’s my parents. Around 100 years old, that’s my grandma. Her perception of time, that feeling of ‘a blink of an eye,’ isn’t just an expression of emotion— it’s a literal reality. I’m starting to understand more and more why Buffett holds onto stocks for at least a decade. For young people, holding for ten years feels like holding for just two years to him.