A 73 year old grandmother was collared by Oklahoma cops for being one of the biggest drug kingpins in the U.S.

Darlene Mayes, 73, is accused of supplying nearly 40 percent of all the marijuana in Oklahoma, Arkansas, Kansas and Missouri.

When police raided her home last week they found $276,000 in cash and four pounds of weed.

Authorities also found a semiautomatic pistol and a revolver, reported.

Mayes allegedly masterminded the drug ring for years. Her son Jerry, who was also busted, cops say working with “Granny Ganja”.

Police found several $15,000 cash bundles which Mayes told them was for her “retirement fund.”

 “It doesn’t surprise me that someone this age would be actively involved in marijuana distribution because there’s just too much money to be made,” law enforcement expert Brad Garrett told  ABC News.

“If they keep a low profile, they don’t talk to many people, and they don’t get greedy, they can go on for years.”

But NOT forever…