Marguerite Joseph from Michigan attempted to enter her real age when signing up to Facebook but was rejected.
When she tried to input her birth year as 1908, the social networking site automatically changed it to 1928.
Her granddaughter reads and responds to all of her relative’s Facebook messages, said she “would love to see” her real age displayed.
“All of our family members always asked how grandma was doing on my Facebook page,” she said.
“Every time I tried to change the settings to the right year, Facebook came back with an unknown error message and would send us right back to a year she wasn’t born in.
“I would love to see her real age on Facebook. I mean, in April she’s going to be 105. It’s special.”
A Facebook spokesman said: ‘We’ve recently discovered an issue whereby some Facebook users may be unable to enter a birthday before 1910.
“We are working on a fix for this and we apologise for the inconvenience.”