It was a film about some old people possibly at a nursing home. Although maybe they were just old people and there was no nursing home. One of them claimed to be an alien visitor and wanted his friend to come to space with him instead of dying alone. His friend was reluctant. I mostly remember the ending where the character was revealed to actually have been an alien and he took his friend with him away from earth in the end. There was possibly an empty chair shown at the end. I honestly don’t know anything else. Any help is appreciated!
Could you be thinking about K-PAX (2001)
with Kevin Spacey as “the alien”.
I think that’s Cocoon 1985