Yes, I agree with the others re the stress. But don’t underestimate, when you get older, the perils of living alone and the potential stress that can cause, along with failing eyesight or hearing (eg don’t turn down glasses or hearing aids if they’re recommended). The thyroid gland is also potentially a failure point - if you start to feel excessively tired, maybe gain weight too, it’s worth getting your thyroid checked out for hypothyroidism.
My mother suddenly developed psychosis (very very late onset schizophrenia) at 94, with no previous history, which has resulted in her being sectioned twice (there are specific wards in MH hospitals for elderly people but it’s still not nice for them). Rather terrifyingly, apparently, this is on the increase especially with elderly women and you can have this WITHOUT any signs of dementia………. there’s a potential link with falling oestrogens but probably it’s more likely to be brain-related deterioration that doesn’t cause the more common dementia or Alzheimer’s.
My mother is now home, finally agreeing to take medication (they don’t believe there’s anything wrong with them) and I have moved her near me.
Take care when living by yourself to ensure you have enough social activities and other things you enjoy doing preferably with other people.