Serious response. I have been involved in eldercare for three parents and a grandparent.
My grandparent had technically the BEST care at the BEST eldercare facilities in my major metropolitan area.
My in-laws had 24/7 in-home care that cost ~$10,000 per MONTH.
In each case, the ONLY thing that kept them safe, happy and ALIVE was the interest/intervention of family members.
Don't kid yourselves: health care "professionals" aren't. In my experience, they couldn't care less.
Even at the "best" facilities, the staff become inured to the suffering and cries for help. Visiting was the most frightening and depressing experience ever, and family members did all possible to help those in "care" escape. (Grandparent contracted MIRSA while in "rehab" from a hip break, hence the facilitization.)
The in-home "caregivers" would ignore, uh, bodily functions, trying to leave the, uh, duty for the next shift. Only the intervention of offspring would keep them in line. "Caregivers" much more interested in their phones. Most (in my experience) do not speak English.
So, yes, having children will help in old age. Of course, dementia may keep you from caring.