PG has one too (I think; a quick search can't find it) but there is a perspective change: "At age 20 if you're not doing bad you fell good. At age 50 if you'r

PG has one too (I think; a quick search can't find it) but there is a perspective change: "At age 20 if you're not doing bad you fell good. At age 50 if you're not doing well you feel bad." I find that to be true, causes you to question a lot of what you've done in your past, and what you're doing in your future with the limited time you have left.