paddyann, I most emphatically was not giving advice, but I was curious, because my only experience of life devoted to family was my grandmother's and, even as a teenager, I found the isolation of her later years, desperately sad and frightening. She didn't live alone. Her husband was alive and had a very active voluntary life, she had a daughter and SiL, and a single daughter living in the house, so she was not lonely, the rest of the family visited and wrote regularly, but she had no interests and no friends, her daughters looked after the house so she had no domestic responsibilities either and spent most of her days sat in the LR endlessly reading Mills & Boone novels.
Shortly after my parents returned to the UK and we ceased living with her, she began to show signs of dementia. I realise, as an adult, that some of her problems arose from her personality, but at the time the isolation of her life frightened me and that fear, not of being alone, I am self contained and self occupying, but of having nothing in life outside my four walls has meant that I determinedly made sure I had a life beyond the home all my life and made sure that DH even when he was travelling constantly, did the same.
Your life has clearly been very different, you have worked outside the home and you still have family responsibilities so is not comparable.