O'Hagan moved with her late husband from Chelmsford, Mass., to Sheffield in the mid 1990s; her husband died a few years later in 2001.
Her kids say that O'Hagan didn't have a boyfriend and had no financial windfall that would make her a likely target of abduction.
"She wasn't a rich woman," a friend, Francie Vos, told The Associated Press. "She was not stingy, but she had to watch every penny."
O'Hagan's family -- her five children, nine grandchildren and 25 nieces and nephews -- all say they remain hopeful their beloved relative will return safely.
"Every day is another day she's been missing, we keep hoping that wherever she is, that someone took her for a reason and that she's well," said another son, 45-year-old Mark O'Hagan.
"But the days are getting longer," he said. "They're definitely getting longer."
ABC News' Don Ennis contributed to this report.