tfturing

Since you consider yourself an older learner, how about trying your hand at "Intro to Mathematical Proof" or "Intro to Problem Solving" books? Velleman's "How to Prove it" and Polya's "How to Solve It" seem like good places to start (after you finish reviewing high school math) and will help you develop a deeper appreciation for the subject.

If I may ask, why the sudden interest in math? I have some experience with the subject and, if you want, willing to give some more advice.