Life is an endless series of a learning process. It doesn't stop educating you and your classes certainly haven't ended even when have reached the big five zero. Observe. Be open to building criticisms. Don't be bitter. We all make mistakes in life and learning from these will make us a better human. Be humble and admit when we did wrong. No one is perfect but that is definitely not a reason Not to improve ourselves.
Life is too short, let's grow up.