Sixty ain't that old, folks. I don't know the state of her health, but you say she was fine, and 60 just isn't weak and aged anymore, if it ever was, absent other health problems. So we have two possibilities: she's very sad over what's happening to her loved one and this is how she handles grief. Have you asked her about it? But it could also be a health problem, such as a stroke. Only a doctor can tell you this by running tests. I'd suggest she get a complete physical from a doctor who doesn't think people age 60 are "weak and aged." I speak as someone who is 63 and most of the people I know are getting old with me but we aren't "weak and aged" yet. But when you get old you do lose friends and lovers and it can add up and make you very sad and lonely. And it can be something physiological. Talk to her -- she knows best what's going on.