Blaine Bettinger had a followup(http://www.facebook.com/home.php?#/note.php?note_id=136361127376&ref=nf) to my How Many Ancestors do you have in the SSDI post.
My earliest ancestral birth in the SSDI is Fannie Rampley Neill, born 1883. I knew three of my grand parents and one great-grandparent in the SSDI. My grandfather Neill died when I was 6 months old and my great-grandfather Habben died when I was 8 months.
My wife's earliest birthdate in the SSDI is 1884. Her grandfather Mortier died before she was born and she was a toddler when her grandfather Lake died. The others she remembers.