My dad is 66, completely independent (newly retired), and I am the executor of his estate. We've had several in-depth conversations about his wishes after he passes. He should have enough money to fund his retirement. I certainly hope so - I'm a single mom who lives in a high COL area and can't support him, and my siblings live in lower COL areas but don't make much.
My in-laws are pretty well-off (self-made) and I'm pretty sure they're fine, but since I'm not married to their son, it's no concern of mine.

I know they will probably be able to help with my daughter's college if need be, but I don't assume.