Lewis Hamilton has opened up on what he plans to do once he retires from Formula One after speaking to a host of sports stars. The 39-year-old has struggled on the track in recent years to increase the thought that he could soon call it a day as a driver. Hamilton will remain in F1 for at least another season having signed a deal to join Ferrari in 2025, ending a 12-year association with Mercedes. He will turn 40 next January but is not the oldest on the grid, with Fernando Alonso holding that accolade at the age of 42. How his first season at Ferrari pans out may have a big influence on how l…