You're never too old. Unfortunately, you're always too young to know it.
I have never considered it my business to disabuse someone of a belief that makes life tolerable for them.
There are more lines formed than things worth waiting for.
Know thyself, or at least keep renewing the acquaintance.
There is no daily chore so trivial that it cannot be made important by skipping it two days running.
Anything we tell our kids about life is a placemarker until they figure it out for themselves.