Most cosmetic surgery isn't permanent.
These big changes often are, though. You may regret it and get it removed, but you’re going to age far worse in any case.
There’s a whole movement right now of these people getting their surgery reversed, but in many cases the long-term damage has been done and you will age worse than if you hadn’t done it. You have scar tissue that will age differently, no matter how minor and no matter what you do.
It’s really sad, because these people are making themselves look worse now and they’ll also age worse, and they’ll likely hate that, then spend thousands more in that cycle, like you said.