Tyrone Boone is just an extremely old roadie that has an extremely old dog that seemingly have been around forever but have only barely aged.
All of that is true, but one word makes it false. Just. He is extremely old with an extremely old dog. They have been around for a long time and haven't aged a lot. He's a roadie, though that originally started as a NOC for the CIA.
Let's start with the first order of business. Boone and Croc have been around since about the time when crusaders were looking for the Holy Grail. Boone was one of them. Boone found the Holy Grail. He, Croc, and Speed somewhere along the line, were the only people exposed to it. When exposed, your aging slows down. So while Boone looks like your grandparents age and Croc a very old dog, both have been around for milenia. It also gives them the power to do what has been termed as "blinking." In the blink of an eye, they can be somewhere else. It's a lot like teleporting.
Boone is also the leader of Some Old Spooks(SOS). They are the main group fighting against the Ghost Cell, made up of old inteligence agents, younger bodyguards, rogue mossad agents, and more. A mix of people united under one banner fighting against the Ghost Cell.
Croc has been Boone's faithful companion for years. He is a cross between a blue heeler and border collie. Croc is a great use, having plenty of practice working against the Ghost Cell and other groups with Boone.