Is she the oldest living Facebook user? Great-great-grandmother who just turned 105 claims to be most senior social networker. She may very well be the oldest living person on Facebook. Maria Colunia Seguar-Metzgar was born in 1907 into an era without the internet, computers, television, and cell phones, but already has 85 friends on the social network. And now, her family claims that the 105-year-old matriarch is the oldest living Facebook user.