I'm 55, have discussed and set up both finance and health POAs with my son.
He knows who I bank with, along with my utility company, tv service, council tax, etc,etc, and where to find all my passwords if/when they're needed.
Everyone should arrange to have these types of talks with their adult children, and get POAs set up, because no-one knows what's going to happen tomorrow.
I don't really want to be negative, but we could be run over by the proverbial bus, and left unable to look after our own finances or be able to make our own health decisions, but if you've had the conversations and arranged POAs, the people you've assigned to take on these responsibilities will be able to do so straight away, but without them, they would be facing an expensive, lengthy, legal fight through the courts to try to get permission to look after these things for you.
Setting up POAs is fairly straightforward and inexpensive (people in receipt of certain DWP benefits can do them for free). You can find forms on the gov.uk website to fill in yourself, you don't need solicitors to do them for you.