This is so nicely stated, how often have we had a suggestion or a thought that I know what they the other person should be doing?
We are all guilty of knowing what is best for someone else, even if you were in a similar situation and something worked out for you. But how do you know whether what worked for you will work for someone else?
Instead of trying to fix the world and others around you, work on yourself to become the person you want to be.
If you still have that desire to share an idea of how someone else should lead theirs, then lead by example let them simply see what you are doing and then if they want to follow they will, and if they do not, you will have simply lead your own life.