DH and I are in our 30's and likely to remain childfree by choice, a decision I've made my peace with....as long as I don't think too hard about my old age!
I am very close to my parents and when the time comes I will be there to help them to vet potential care homes, drive them to appointments, assist with bills and paperwork, take them shopping and generally advocate for their best interests.
Assuming DH dies before I do, I will have no one to do the same for me.
I have nieces and nephews but they will have their own parents to care for and whilst I have good relationships with them all, I certainly wouldn't say we are "close" in that way and I have no expectations of them.
I'm interested to know what others in my position have done to prepare for old age. Have you had any special changes to your will? Or made a living will? How do you plan to combat loneliness? For those of you without children who have good relationships with your parents do you also fear the day that they are no longer here?