(on Wikipedia)
https://www.imdb.com/title/tt13361448/
https://www.amazon.com/Night-Sky-Season-1/dp/B09Q21THBW
A retired couple has a secret chamber buried in their backyard that leads to a deserted planet. When an enigmatic young man arrives, their quiet existence is upended and the mysterious Chamber they thought they knew so well turns out to be much more than they could have ever imagined.
They really, really, lean into age in this show.