In no particular order, I want to speak from my experiences. Mostly about body parts. And soul parts.

I'm 67 yrs young. Have three kids in 3 marriages. Wrong #1.
I wasn't ready, and never will be, to have kids. Or be married,
Be sure you got what it takes to raise 'em.
And I'm not talking money. The only thing I provided.
Remember that when God gives no kids, the devil sends nephews and nieces.
Help with one of those or get a pet.

Take care of your body no matter how depressed you are.
I was in a one year depression only going from the computer to the kitchen to my bed.
Before this happened, I was a normal man. Probably looking and feeling 50.
Now look and feel 90.
Try and feel your hands behind your back. Or get up from the floor without touching anything else.
If you can do it, don't lose it. I did.

If you don't need glasses to read, don't wear 'em. Nom matter how much you squint. I could read without 'em until my wife (almost blind) nagged with the squinting. She has an operation to have Hi/Lo beams and STILL wears glasses. Please, I don't care if you put the book a mile away.`Or squint your life away. I started 6 months ago with a 1.25. Now a 2.00 doesn't look clear. That fast.

Tiring easy is my new hobby. Can you walk a mile in 20 mins?. I could fastwalk 5 in 55 mins. I think a world record. Without running. I've measured that distance more than 10 times, because I can't believe myself.
Guys at the gym didn't even try.
Can't walk the dogs properly now. But I'm trying. Hard.

How many pullups you can do?. Won't give you a number from before, I never counted. Until I tired.
Now I can do ONE, jumping. Of couse, I was pulling 165lbs. I'm pulling 201 now.
Take care of your body. You will last more than you think. I was programed to last 50, and lived that way.
I don't repent but given a chance to a little guidance from someone I would listen to I would not have "Arthur" (Arthritis.)

Sorry, as I said. I tire easy. More coming later. If only one listens, my effort won't be in vane.