On or before December 31, 1998, depending upon how the plan will be amended, an employer can give employees a choice of whether to commence benefits or not OR automatically commence benefits. (I question whether automatic commencement is permissible under the ADEA once it is no longer statutorily mandated, but I don't suppose too many people would object in a defined benefit plan.) After December 31, 1998 (or the date the amendment is adopted, if later) the plan can provide an option for age 70 1/2 commencement or eliminate it. I see nothing in the regulations or other guidance that, without participant election, would permit payments to be suspended after December 31, 1998 for employees who attained age 70 1/2 on or before that date.