404.310—When am I entitled to old-age benefits?
We will find you entitled to old-age benefits if you meet the following three conditions:
(b)
You have enough social security earnings to be fully insured as defined in §§ 404.110 through 404.115; and
(c)
You apply; or you are entitled to disability benefits up to the month you attain full retirement age (as defined in § 404.409 ). When you attain full retirement age, your disability benefits automatically become old-age benefits.