A good mentor will tell you what they got wrong. Hold on to that kind.

Advice made only of successes is close to useless, because it leaves out the part you are actually walking into. Somebody willing to describe their mistakes is handing you the expensive information and also showing that they are not managing their image around you. That willingness is rarer than competence. It is the clearest sign a person is on your side.

Ask whoever is teaching you what they would do differently if they were your age again, and ask it directly. Keep the people who answer honestly and spend more time near them. In time, be that kind of person for somebody younger.