It depends on a few factors besides age alone.
First, is he politically protected by an Senior Executive, Vice President or Company Officer?
Second, does he have unique knowledge and skills on a business process, Tooling, IT System, Legal/ Accounting Strategy, or EHS/ Environmental Compliance that would be very hard to replace.
Third, does he have any dirt/ leverage on executives that they would not want public and thus would want to keep him happy.
Forth, Is he protected by a union?
Fifth, is he a member of a minority or other protected person such as a GLBTA, African American, Asian American, Hispanic American, Veteran, Women, Disability etc. which would give leadership pause due to any legal risk they would face from his termination.
Next, does he qualify for the normal special retirement programs at ages 55 or 60 (SERO, SLVB, etc).
Where does his compensation rank vs similar employees and their expertise?
Finally, how bad is the business case for his part of the business. If things are bad enough financially, even those who in normal times are protected as individuals become targets as entire facilities, HQ’s and divisions get shutdown and sold.