OP, I was married for about 18 years. I knew nothing about finances, really, exH 'took care' of everything.
One day I realised that he is truelly, astonishingly crap with money. And that I earn much more than he does, I used to put everything in the joint account, he didn't. And that I'm being taken for a ride.
So I educated myself financially. He used to smirk and take the p* every time I used to read the money supplement in the paper, when I was asking other people about investments and savings. I didn't even have my own car insurance, ffs, or a credit card in my own name. He even convinced me we can't afford to pay into my work pension, so I opted out and missed 5 years of a very good pension. Only idiots and rich people who work for fun can afford to do what I did. I was an idiot.
So, little steps, I started with paying back into my pension. He had a hissy fit, I ignored him. I looked into SIPPS and compared it with my work pension.
My next goal was 6 months' salary in a savings account. All my overtime went in there. All this time I has the spanish inquisition about my personal spending. Made me feel guilty for a new t-shirt or underwear. So I used to get cashback from the grocery shop and stash that so I don't have to have the 'so you really needed that, we can't afford it'. I'm not stupid, we could afford it, but he was after the control. Anyway. I then opened a stock and shares ISA, a regular savings account. I got a credit card.
I had to battle with him over silly things like tax returns, married allowance, child credits etc. The man not only didn't have a clue, but he was offended I take an interest in finances, OUR finances. He couldn't stomach I earned more and was learning to be independent. So he demeaned me, called me a control freak, mocked me. So we split up. I bought my own place. I had enough to furnish a home from scratch and be left with a bit of savings. I'm doing ok. He..not so well.
The moral of my story is: it's not too late! Start small, educate yourself and go for it. Because if the proverbial hits the fan it'll be a steep an painful learning curve.