I think you are misinterpreting OP's comment. They didn't say that old people aren't out doing many things, they said that it was normal to assume that old people aren't out doing many things. There is a difference.
I still think that OP is incorrect that this is evidence that previous comment is not ageist. Just because most people hold the same prejudice doesn't stop it being prejudice.
Back in the 1920's it would have been quite normal for white people to assume that black people (like myself) were inferior. Just because it was normal doesn't mean it wasn't racist.
>Back in the 1920's it would have been quite normal for white people to assume that black people (like myself) were inferior. Just because it was normal doesn't mean it wasn't racist.
Not the same. You can't measure inferiority. You can measure activities, time and age.
No, it's not normal. Not at all. I hope for all that's good it's not your life when you're old, or if you're old it's not your life.