Learning from counter-example

How can someone who failed at something give advice to someone who is only at the beginning of the process?

Perhaps the counter-example is all that is needed.

Perhaps it was like a fork in the road and you took the wrong fork. You can give good instructions up to the fork, and then tell them which is the right one to take based upon your knowledge of which path was wrong.

Perhaps you are older and wiser, now.

Perhaps it is your duty to give it. Even advice from someone who succeeded is only advice. Who knows what will be heeded?

So, maybe I will be able to talk to my daughters about husbands and marriage.