Wow - this is totally encouraging. I just turned 50 in March and within the last year and a half have become obsessed with numbers. I am compelled daily to find the prime factors of zip codes, addresses, and RSA numbers. I saw the Christmas lights on my house in binary. I love the patterns and personalities of numbers.
Though I am not as wizardly as you all, I blew through an elementary algebra text in a weekend, find that geometry is returning easily, and I'm on my way to really enjoying trig and calculus, although I really want to explore discrete mathematics.
So reading through these posts has really boosted my confidence and enthusiasm. Thanks to all!!