"(1) Section 94 does not apply to the dismissal of an employee if on or before the effective date of termination he has attained - (a) in a case where - (i) in the undertaking in which the employee was employed there was a normal retiring age for an employee holding the position held by the employee, and
"It is not ... sufficient to establish the existence of a normal retirement age, that an employee holding one position should overhear conversations amongst employees holding a different position which suggests that that which had been wholly uncertain may now possibly have become more certain. ..."