Not really sure, I went to a school at a time/place where most went into trades not for advanced degrees. I don't think my class has a single, Dr, lawyer, engineer etc but there are plenty of successful skilled trade workers, social workers, business degrees etc. Several of my class mates went back to school as adults, one friend of mine became an RN two weeks ago at the age of 49, another friend returned to school in her 40s when her kids were grown and is now a mechanical engineer.
One interesting thing is that of my social group, we all pushed our kids to obtain college degrees and to pursue a career before starting families. Pretty much the opposite of what most of us did.
My DS and I were talking about this just yesterday, he has the highest education level of his high school class. DS graduated with 500 other kids and as of last week, he has the highest level of education with a doctorate in Physical Therapy.