I would diplomatically ask them if they have a close relative (son, daughter, sibling) who has POA for each of them. With their permission you might want to talk with that person about health surrogate, living will, will, possible living trust. You don't want to be intrusive but you want to help them out if you can about necessary items such as beneficiaries, etc. I know from experience when my mother passed away in May (Alzheimers) that with the privacy policies in place it can be a problem if one has to deal with nursing homes and hospitals. This way you can also let that person know that you are available for possible advice or information they may need.
taxbilly