Many severance packages preclude filing such lawsuits as part of accepting the package. Also at another large tech company I have seen statistics including age

Many severance packages preclude filing such lawsuits as part of accepting the package. Also at another large tech company I have seen statistics including age published by the company when they make layoffs that would tend to refute any possible age discrimination. Easy for a company to fire a few more juniors to get the age stats clean, then quickly rehire. So the law is in place, but in practice it is limited in effect. On the hiring end, age discrimination is rampant.