Every year I was an undergrad, my score in the Putnum math competition dropped (in my first year I got the highest score in my school, second year I tied for highest, third year I was middle of the pack and fourth year I was so stressed about other work that I overslept on the day and missed it entirely).
That's the only emperical evidence I have, but it suggests that higher education was worse than useless for me
Old programmers never die, they just become managers.