The most successful people in life, kept trying, fell and then tried again and eventually succeeded.
I did a course to own a Real Estate Company at 40 years of age, was I worried? Yes, lots of Legal stuff what would i know. But, I passed.
At 53, I did a Course, to be come a qualified florist. Was I scared, well not really it was a passion and I was determined.
Did the first course perhaps help that? Heck yeah.
You are more mature, stop putting yourself down as if you "can't" there is no such word.
Start studying now.
Study words, language, something you like and are interested in, just read online, look on google, so you start going "ahh I see, got it" and then go for it.