The preceding line was about subjective time passing. He's not saying you'll be dead by 70, he's saying everything after 35 feels like it goes by way, way fast

The preceding line was about subjective time passing. He's not saying you'll be dead by 70, he's saying everything after 35 feels like it goes by way, way faster than the first 35. I certainly feel that way, and may even adjust that number down some myself.