Depends on what you mean by “going ethos.” Healthy perspective on an employment relationship from your perspective, yes. Anathema to a large number of Silicon Valley startups where you will likely get branded as neither a culture fit nor a team player, as well, yes.

It’s wise in the Valley to hold such an opinion but not make it very prominently known. There are a number of people who want your job and will say something more palatable to your employer, and eat your free meal while shipping a feature at 10pm because they buy into the posters on the wall. Many allegations of ageism (but not all) can probably trace back to something like this, in my uninformed gut opinion, because you will almost certainly get replaced by a new grad when the hammer falls. I don’t even see it as personal, but a demonstration of incentives: they can get a loud 40 from you or a quiet 80 from a newly minted BSc. QED.

Just decline invites and push back on over 40. Expressing that attitude at a typical company within this audience basically paints “please lay me off” on your back. When you’re getting into post-senior titling, or you’re really specialized in a tough req to fill, is when that approach becomes more feasible.