My [math] skills have atrophied to about a fifth-grade level.
Unless you're working in a job that demands sophisticated math, that's probably about all you need. I mean, how often in our daily lives do we have to find the square root of anything? (And what was the purpose of that, anyway?)

Plus, we now have calculators and computers, which we didn't have when you and I were in fifth grade. Calculators only started to come in when you and I were in high school.
In a similar vein, I heard something recently about new attempts to make kids understand mathematical concepts, instead of just learn how to add, subtract, etc. I thought to myself, "OMG, that sound an awful lot like the 'new math' that was in vogue when I was in elementary school: 'Subtraction is the additive inverse,' shit like that taught to first graders." WTF? It was a disaster in 1964-65; I can't see it being an better now.
Which means that by the time I tried it, it had been illegal for less than a decade. 
The other thing I came away with from that article is, If LSD can successfully treat anxiety in cancer patients and the terminally ill, why can't they titrate the dosage and use it to help people who "just" have Generalized Anxiety Disorder? If I had a bad case of GAD, would I be willing to treat it with one or an occasional session of LSD with a therapist instead of having to take medication every day? I sure would!