My wife was let go from her job today, she's been employed at this location for 20 years. She's the oldest Technician at this place at 55 years old.

Employment law including the age discrimiation law is very complex. There is much, much more information we need to know before we could say whether she has a claim or not. The only way to get the information we need to know is to have a consultation.  However, if she is a long term employee, oldest in her job category, performing well and there is other evidence to suggest that she was targeted because of her age, then I strongly recommend you consult with an employment attorney.