57 yrs old falls asleep the minute he sits down and hard to wake up. Is there medical condition to cause this or supplements to fix ?

Time to call for a doctor appointment.
Now it also depends on the 57 year old's schedule.
If he is up at 5 getting ready for work, does manual labor and gets home early in the evening and does a few things around the house then I also would fall asleep when I sat down.
On the other hand if he does noting all day the sleep could be boredom or depression.
Only a doctor would be able to get to the bottom of this.
There are medical conditions that can cause a person to be tired. There are medications that can have the same effect.

We aren't medically trained to guess at such a thing, especially without knowing the person, history, medications and etc. This is unusual, especially the difficulty in arousing someone this young. You need to take this question to the individual's doctor.

This is a question for the 57 year olds doctor. Time for a complete medical evaluation