I'm 77 and have been legally separated from my husband for two years. Is it wrong to move forward with the divorce?

I’ll give you a slightly different slant on this. It may not be relevant because DH1 and I had been separated for 35 years, I’d remarried DH2, and DH1 had had more relationships. When he was diagnosed with virulent liver cancer, we had the best relationship we had had for years. I visited him many times. He was talking about old memories, offering me things that he had taken when we split up, just being nice. DH2 helped by lending him things we kept from MIL2’s last illness. He died less than 6 months later, and our final good relationship helped our two daughters to use my support for selling his house, getting me to deal with assets etc.

Perhaps you could check his life expectancy, because it’s different if it’s quick. If it is, marking time for just a few months might heal old wounds – it did for me.

I guess that is only a question you have to answer, why do you feel guilty? if you left for other reasons then why feel guilty? You can still support him IF you feel like you should, but it doesn't mean you can't get divorced. I had a friend who gave her husband ample time to get things straight for his own insurance, etc (he was diabetic and in bad shape), but she finally filed for divorce but left him live with her for his remaining time. she went out with friends, etc. You should speak with him and (if you are both on good terms of being separated) let him know of your intentions. wishing you luck.