If you are the oldest in your job description in your department, polish up the resume.
If your family has high healthcare costs, polish up the resume.
If you are 40+ years old, polish up the resume.
Don't for a second think that Micron dosen't discriminate based on age when doing a RIF. The severance package is a bribe, plain and simple. It calls outthat you are waving your protections of the age discrimination act by signing it.
Ask yourself or your coworkers how many people they know that have retired from Micron vs been driven out with performance management, Layoffs, or voluntary severance.