5 C.F.R. § 1650.15 Abandonment of inactive accounts.
Title 5 - Administrative Personnel
A separated participant must select a full withdrawal option by the time he or she reaches age 70
Title 5: Administrative Personnel
PART 1650—METHODS OF WITHDRAWING FUNDS FROM THE THRIFT SAVINGS PLAN
Subpart B—Post-Employment Withdrawals
§ 1650.15 Abandonment of inactive accounts.