A person living alone deserves practical backup without being treated as incapable.

Living alone raises the cost of ordinary mishaps. A bad flu, a broken boiler or a fall has nobody else in the house to absorb it, which is a practical fact rather than evidence of fragility. The mistake is swinging between ignoring that and treating the person as unable to run their own life. Backup is what helps, and supervision is what does not.

Set up something specific with someone who lives alone: a spare key, a standing check-in, a name to call. Offer it as an arrangement between equals rather than as concern.