I believe that as well as needing a purpose in life be it work, writing that novel, writing poetry, to run a marathon -whatever your purpose is but I think we all want to be needed. Children, grandchildren, husbands wives, parents, in laws, nieces, nephews the list is endless.
When we had young children I was tied up in their lives school, dancing, gymnastics, horse riding I never stopped being the chauffeur. College, university the usual they moved away and I was working full time then my husband became ill and I was working, doing exams at adult education, looking after him and I was a Guide Leader! Phew. Then the girls came home!
I was back working, adult education, husband was better but not 100%, Guides, swimming, going away for work; busy, busy, busy. One daughter left and had a baby with her partner the other was never there. Out of the blue I had a stroke. I became reliant on others and was not the carer anymore. Gave up work as I couldn't cope.
Life was so different, from being in charge I was the 'patient.' Since then I have got worse with rheumatoid arthritis, osteoarthritis, fibromyalgia, thyroid problems, diabetes, degeneration of my lumbar area and herniated disc in the neck and other health problems. It is devastating when you have been so busy. The problem is not just the pain, inflammation it is the fatigue that gets so bad. I have to use a wheelchair which means I am pushed around and no independence.
We do take the grandchildren that live with us out and about but it isn't like when they go out with their parents. I can do crafts with them and they always want to 'make something' I have made some bracelets, saying rheumatoid arthritis, I have diabetes and I have asthma. Also some keyrings for my daughters with their childrens' names on them. My older gd wants one saying 'I love mummy' and my older gs wants one with his best friend's name on it! So out come the alphabet beads and elastic I feel useful again! I make cards too and my favourite hobby is photography. I use my pictures for cards too.
I get hugs and kisses from the grandchildren and the little one of 28mths always picks me wild flowers when he and his mum go to get the bread in the village. It takes ages to walk back apparently as he stops to pick dandelions! Lovely gift and I have to put them in water!!! 
I make bread my bread in the bread maker my husband loves it and helps me by weighing flour and getting the water. I make cakes with his and he or the gc help with that especially as the children always want mamie's cake or biscuits.
Being needed is very important, for me and for them.