He'll be too old, and all he had is gone. If he ever gets out he'll live with a relative, and occasionally see old friends to talk of the old days. It is the same for anyone who has been separated from the world for 25 or more years, things have changed so much
I can't imagine how they adjust to plain old everyday life. Different culture, demographics, cameras everywhere, and the simplest things such as doctors appointments often requiring a basic use of today's technology.