I was predicted an 'F' by my horrible Maths teacher and achieved a strong 'C'. I did it by using a DVD called 'My Maths' which shows you how to do all the maths problems from grade G right up to grade C. You systematically work through all the lowest grade maths problems all the way up. For me, it was a case of doing little and often.
After you have watched them demonstrate how to do it, you then try some problems of your own. Then the answers are shown as well as it showing you how to work out the answers. I did this several times a few for about 4 months until my exams. There is also a site called Maths Watch which does pretty much the same thing as 'My Maths' and is very useful. You are not too old! My Grandmother is in her 90s and has never felt confident with maths at all. She has bought a primary school maths text book to try and learn some. Never too old to learn, ever! Xxxx