“Because the ADEA prohibits discrimination on the basis of age and not class membership, the fact that a replacement is substantially younger than the plaintiff is a far more reliable indicator of age discrimination than is the fact that the plaintiff was replaced by someone outside the protected class.”
Huske v. Tyson Foods, Inc., 4:12CV583, 2013 WL 5832248 at *4 (E.D. Tex. Oct. 29, 2013) (Bush, J.).