Who says Keyshawn Johnson has lost a step? Though his days as a pro wide-out in the NFL are long behind him, dude is still speedy. So speedy in fact, at 40-years-old, he still chased down the younger, spryer Justin Bieber.

Well - chased him down in a Prius.

Okay, so maybe he  shouldn’t be lining up against Darelle Revis on a go route any time soon, but the citizenry of Calabasas, CA owe him a debt of gratitude for keeping the increasingly volatile Bieber (who continues to challenge Amanda Bynes for the title of “Next Celeb to go Full Brit Brit”) from doing any serious damage last night while he was out speeding through the community where they both reside.

TMZ reports that Johnson’s agent Jerome Stanley confirmed that while his client was walking with his family through their tony neighborhood, Bieber blew by them at “breakneck speeds” in his Ferrari. Stanley told TMZ that Keyshawn is” very, very, very livid,” and that he “is taking the situation very seriously…He wants Justin to slow down and be a responsible neighbor.”

Johnson was reportedly so upset that he went after Bieber (again…in his Prius) and tried to confront him at his home. When he arrived, however, the compact, Canadian crooner, who “appeared stoned”, ran and hid inside his house.

Calabasas police received numerous calls about Bieber’s erratic driving, and the L.A. County Sheriff’s Dept. has launched an investigation into the matter.

So maybe Key can’t beat a DB for a deep ball any longer, but ViralRead will put our money on “Mr. 7-Eleven” (thaaaat’s right - ‘cuz he’s always open) in his Prius vs. a tanked-up Biebs in a Ferrari every time.

We’ll let you know as soon as Vegas posts odds.