Patrick Stump is trying to be a “cool dad” while he still can. The 40-year-old rock star – who has Declan, nine, and seven-year-old Antero with his wife Elisa Yao – is best known as the lead singer of Fall Out Boy but also works on the composes the music for ‘Spidey and His Amazing Friends’ and has been “savouring” hids kids’ admiration for him because he knows that he will become “lame” to them as soon as they hit their teenage years. He told People: “They love the show, which makes it such a joy to get to talk about. No one’s parents, no matter how cool you are, you are never going to be the…