IMO taking Calculus later in life is probably easier for most (study of 1) people (assuming you have seen some of it before). I took Calculus at 19 years old and passed but I did not have any idea what it was really used for. Taking it again during Grad School (mid 30s) Calculus made way more sense. Ideas would click (mostly not CS related) but more in the general world view (think washers for nuts and bolts – area under a curve). I will be the first to admit that making front ends and tuning a DB will almost never need any calculus (but it does happen) and admit I did horrible in high school but turned it around in college (I was behind when I got there the first time for sure). How much do I remember right this second (not much), but I do feel its worth doing as if only a right of passage to say we deserve that 6-figure salary and maybe not feel too bad about calling our self’s engineers. Good luck with the singing lessons and new job, but if your married (or have children) do NOT quit that day job just yet If not, well hell go for it my friend!!!