Memories, hands down.
I think classroom education is overrated. Hands on, on the job education, work experience is far more valuable. What you learn in the classroom often isn't how things are done in the real world outside academia.
My daughter is dealing with that as she has returned to school at age 34. There are 12 students in her program, and she is the only one over the age of 20. And she is older, so far, than her Professors. She has to unlearn how things really are, and relearn the textbook version of how things are done.