From a fellow 30 something, I too started when I was 34, DL'd with BGS and found the maths to be no problem, you are allowed a Calculator. For the record I did crap at maths at school and have used a calc ever since. I would echo Whirligig's comments. Also Whirlygig, I thought that dress you wore on the gatbash was divine.
You will be fine, just take your time, everything you need will be in your books. You just need to remember the formulas, if you go the BGS route you will have lots of help.
FF
Just to add that Pilots are lazy when it comes to maths, everything needs to be simple when you are under stress, Three times table is useful to know when you convert to jets.