Forty is the line of demarcation that says you're an adult now. You're an adult, so don't pretend you're a kid anymore.
“Examples is more forcible than precept. People look at my six days in the week to see what I mean on the seventh.”
“These charges that have been made against me, that Prof. Prescott has made, has charged against me, that I denied the atonement in conversation with him, are absolutely false.”