|I guess the worst someone could do would be to Add 2 digits AFTER the '21,' but then would any of this be relevant in a new millennium???!!|
Like some others, tho it's become the norm to go 4-digit across the board.
When those annoying automated VRU phone prompts request dob - I'm nuts by then; please enter two digit day, two digit month and four-digit year! lol
My brain is 4-digit friendly. All my # passwords, pins, former employer ID, SSN code follow same format. You should see me at the grocery store pin terminal (hmmm, let's see . . . it might be 2xxx or 0xxx or 19xx or xx62!!)