Community College is one approach up to the level of an AS degree. The program for, say, Mechanical Engineering, consists of 4 semesters of math beginning with Calculus. The thing is, most people don't have the Algebra and Trigonometry skills to start Calculus. So there is another 2 semester Pre-Calculus course that is usually required (it is here). Suddenly the 2 year Community College is stretched out to 3 years.
Hint: Don't try to take a Pre-Calculus course during the short summer semester. There's a reason for saying this... It worked out but, damn, it was a lot of work in a short period of time.
But simply getting the right answers to problems is pretty meaningless. It is only in applying the math to real-world problems that it is useful. Word problems! Everybody hates them but they are the only meaningful way to evaluate understanding. Lots of word problems!
Big hint: Draw a sketch! Engineers can't even talk without a pen in their hands. Always sketching...
Calcworkshop.com (fee required) is EXCELLENT with all the lower division math up through Differential Equations. This program is worth every penny! Watch the free demo on "Limits". This isn't my favorite topic but it turns out to be useful later on. And it is required early on...
Remember, I said 'lower division' - the first two years of a 4 year program that will probably extend to 6 years. There will be more math in the upper division courses. Field Theory comes to mind for the EE program. And, yes, Differential Equations is a lower division course!
Khan Academy, 3blue1brown, NancyPi, and a host of other YouTube channels are also very helpful. For actually solving problems, desmos.com (graphing) and symbolab.com (solving) are bookmarked on my computers. There are so many resources it is simply unbelievable.
The stuff above is current; it's my grandson's program. I'm riding along to relearn what I thought I used to know but, damn, 45 years is a long time. As it turned out, I never used my EE education for very much. I had better ways to make a living.
We didn't have the elegant tools back in the early '70s so the courses were probably a little more shallow. Things like Fortran and Matlab make the courses more approachable. Don't overlook the fun of coding up Riemann Sums in Fortran - if you are a very old Fortran programmer.
It is absolutely possible for older people to learn math. In fact, we probably should! We need to keep our brains engaged.