Know When to Be Silly and Serious

As personalities vary among us, our maturity varies as well. So, someone younger than us won't appear to be sensible to us sometimes, yet we have to go with the flow and act a lot like them. 

As for elders, speaking in common terms and within topic assists in giving them the thought of us as someone relevant.

Despite off many factors, however, reacting to their feelings with sympathy instead of showing judgemental actions can work for both.