By Andrew Holleran Jimmy Johnson and Troy Aikman are still looking good. At 78 years old and 55 years old, respectively, the former Dallas Cowboys head coach and star quarterback enjoyed some time in the sun together. Johnson, an avid fisherman, appeared to have Aikman out on his boat in Florida. A shirtless photo of Johnson and Aikman is going viral on social media. Cowboys fans are loving it. “I’m already excited for the shirtless pic of Dak and Mike McCarthy together on a boat 25 years from now,” one fan tweeted. “If Troy was playing today he would be the second best QB in the NFC East behi…