Know or listen to those who know.
The wise does at once what the fool does at last.
Begin to be now what you will be hereafter.
Be gentle to all and stern with yourself.
Either you run the day or the day runs you.
You never know what motivates you.
The most effective way to do it, is to do it.
Do not weep do not wax indignant. Understand.
Go for it now. The future is promised to no one.
Never complain and never explain.
I'm someone who's done the opposite of whatever the received wisdom is, to keep your career going into your 50s.