Now, now, now....lets not have prejudice against anyone over 30
... If you live to be old enough, you will find, that stubbornness is not just an "old person trait". It's a personality trait shared by many, "you know what you know"' and no one can tell you different, usually because of a fear of looking stupid or worthless, etc. Often people accept things at face value and never research or verify to see if it's true or if it's mostly true, or not true at all...... There are gems of wisdom and knowledge to be gained form many people, but you have to dig and search and recognize them when you find them.