In 1988 at age 32 I went back to night school for technical math classes including calculus. Two years later with a straight 4.0 GPA, I had to quit for work and travel related reasons for a business start up.
Because I have never had to apply what I learned, my retention is close to zero. Perhaps a few refresher courses would bring some math theorem and formula back to life, but for now I feel like a big nil.
