unfortunately with the way it was set up this year the accounts don't transfer from old gen to current. if he wanted to continue 24 on old gen and switch to current for 25 he could, or he could restart his grind and rebuild his team while also taking this year to get used to the difference in gameplay from old to current. not the greatest reality, but I hope he still continues to have fun regardless!
unfortunately with the way it was set up this year the accounts don't transfer from old gen to current. if he wanted to continue 24 on old gen and switch to current for 25 he could, or he could restart his grind and rebuild his team while also taking this year to get used to the difference in gameplay from old to current. not the greatest reality, but I hope he still continues to have fun regardless!