Original Summer House cast members Kyle Cooke, Amanda Batula, Lindsay Hubbard and Carl Radke have come a long way since debuting on the Hamptons-set Bravo reality show in 2017. “I’ve changed a ton,” says Kyle, who recently brushed off rumors he was unfaithful to wife Amanda, 31. While priorities have shifted for some — Kyle and Amanda wed in 2021; Lindsay, 36, and Carl, 38, got engaged last August — the stars of the show (including returning faves Danielle Olivera, 34, Paige DeSorbo, 30, Ciara Miller, 27, and Mya Allen, 31, along with newcomers Gabby Prescod, 32, Samantha Feher, 25, and Chris Leoni, 30) are always down to party. “Don’t listen to anyone who tells you to act your age,” says Kyle, who recently turned 40. “Age is just a…