Mason, along with backup quarterback John Beck, tight end Edgar Jones and practice squad wide receiver Justin Harper, sang solo and group numbers Tuesday for the seniors at the Oak Crest Retirement Community in Parkville, the Baltimore Sun reported Wednesday.
"I don't have an 'A' game when it comes to singing," Mason said. "So I go out and try to bring my F-plus game. I enjoy it. We did a few stops last year, and I was glad to come back here again this year."
The seniors, many of whom came dressed in Ravens apparel, welcomed Mason's admittedly "off-key" singing.
"Last year when he came out we had a ball," resident Ellie Witty said. "It's wonderful."
Reindeer recovered after escaping from Santa during lighting ceremony
'SNL': 'Anchorman 2' cast, One Direction sing 'Afternoon Delight' [VIDEO]