Agreed. I wish I could have spent more time with my parents when they were younger. At least they were able to retire early and we're making up for it in adventures nowadays.
My parents retired early too, and it looked like we were about to be in a similar situation, but then my mom caught a rare and aggressive form of cancer. It happened so fast. We are all still in shock. Don't take any moment for granted, and call your mom—even if you're busy.