When you propose drastic measures like surgery, I think it crosses that line. If you don't believe me, why don't you either answer my question or explain why the analogy to sex/race/gender discrimination doesn't apply? Why would you not propose cosmetic surgery to cope with the "manifest reality" of being black or female? (Besides fear of the repercussions if you did, that is.) Why is one "realistic" when the other is clearly out of bounds?
Any complete list of suggestions would include at least a few items aimed at challenging the bias. It doesn't have to be "systemic change"; it could just be calling out the behavior in a specific environment or context. Maybe that would work and maybe it wouldn't, but the same could be said of your "just fit in" suggestions. When the list is so one-sided, it implies that acceptance is the only logical course. That's wrong. It's not enough to admit that ageism exists (and then only when challenged). If you don't acknowledge the need for change then you're part of the problem.
P.S. Since you keep re-editing what I'm responding to instead of adding new responses, putting it off isn't so great either. Yeah, sure, we'll start thinking about justice some day. We have more important things to worry about this week, right?