Calvin Johnson responded today to the Detroit media about the comments made by Ravens’ safety Matt Elam that he’s “pretty old.”

“Sometimes you keep your mouth shut,’’ Johnson said. “He’s a rookie he’ll learn.’’

When will he learn?

“Hopefully this Monday.”

Did Johnson know who Elam was?

“Nah, I didn’t.’’

Johnson has had success against previous defensive backs who have slighted him. Coincidence?

“It’s motivation, but moreso coming from somebody I’m actually playing. I’m playing him but I see him, like I say, if I run past him down the field it’s not like he lines up on me every play,’’ Johnson said.

Kickoff at 8:40 p.m. Monday.