A senior official at the Department for the Aging is facing disciplinary charges for allegedly cheating on her timesheets.

Sources said Assistant Commissioner Karen Shaffer, a 16-year agency veteran who earns $140,461 a year, could be demoted after the Department of Investigation uncovered irregularities in her records.

“The Department for the Aging is cooperating with the appropriate authorities,” said agency spokesman Chris Miller.

One source said Shaffer, the mother of 5-year-old triplets, sometimes worked at home under an arrangement approved by the agency’s former commissioner, Edwin Mendez-Santiago.

But Mendez-Santiago told The Post said he had given no such permission.

“Off the top of my head, I don’t recall any arrangements of that nature,” he said.

Mendez-Santiago quit abruptly in December 2008 after his secretary filed a lawsuit accusing him of sexual harassment.

He denied the charges.