reasonable factors other than age

Meacham v. Knolls Atomic Power Lab., 554 U.S. 84, 128 S. Ct. 2395 (2008)

When the United States government ordered Knolls (one of the contractors that maintains the nation’s fleet of nuclear-powered warships) to reduce its workforce, the company conducted an involuntary reduction in force, resulting in the layoff of 31 employees, 30 of whom were age 40 or older. Twenty-eight of the laid-off