Maybe to all. Either way, you need to stop posting on the internet (even if you think it is private) as it can only get your company and you in more trouble at this point. Asking for a guess about what your employer may or may not do won't help at all, and your posts and emails to and from this site are now subject to discovery if and when the company is sued.
If you terminated someone over 40 because of their age, the terminated employee would have a cause of action for discrimination. I cannot tell you whether the employee will sue you or the company. I suggest you contact an attorney and seek some advice before you discuss this with anyone.