Except that doomscrolling causes aged folks to deteriorate in health faster than being active in some way, just like for everyone else.
If it were simply that they weee living their own lives, I don’t think anybody would take issue with that.
But they aren’t - they are spending their lives on their phones, doomscrolling, which is much more likely to cause accelerated aging.
No, I don’t have a study for this, but it is not a secret that being active and not on your phone improves health outcomes.