The adult 'child' will feel differently. They may listen to the advice given, but will not necessarily follow it; to placate their parents, they may nod in agreement, and then do their own thing. In time, parents will become grandparents and the family bond will extend over another generation. Then, at some point, there is a change in the hierarchy. The parents will realise that they're being advised by their children who think they know best and have modern, more sensible ideas.
This happened recently when I was ill. My three 'children' seemed to take on a parental role, not to their own children, but to me! They chatted amongst themselves and then decided what would be best for dad. Advice was forthcoming from each of them; I was to take it easy, stop heavy jobs, eat healthily and accept that I was getting older. I was pleased that they cared and it was only after a while that I realised that our roles had changed. I was now the older generation listening to my offspring giving the advice.
Although I've fully recovered from my illness, my children's concern continues. Each email or call begins with an enquiry as to my health and a reminder to slow down. I guess that I'll have to acknowledge that I'm a 'senior citizen', even if I don't feel it, and should thank my children for their concern. In truth, I'm amused by the change of role now that my children are adults. At some stage, though, I think that I'll gently remind them that I'm still capable of making decisions and living independently, even if I quietly admit to myself that I'm ready to adjust my lifestyle as I head towards old age.