Agreeing with this statement would amount to casting aspersions on the wisdom of parents, to which all teenagers looked up to. The teenagers knowledge maybe significantly more on a particular subject, but with respect to being worldly wise, they are far behind their parents. This is for parents have knowledge blended with years of experience. This makes them more worldly wise then the teenagers, who are on the threshold of life.
Years of experiencing the many ups and downs of life make parents a better judge of human character and nature. They can therefore judge people more accurately and are not waved by superficial factors. On the other hand teenagers are swayed by superficial factors. On the other hand teenagers are swayed by superficial, irrelevant factors which may just be a facade and far away from reality.