Ghosts Can't Do It (1989)

Scott and Kate are married and very much in love with each other. Scott is more than 60 years old, while Kate is at least thirty years younger. When Scott dies, his soul cannot get peace and he becomes a ghost only Kate can see and speak with. Scott wants to return to life, and him and Kate hatch a plan to let a young man drown so that Scott can take over his body. Also, Kate must handle Scott's company's business deal that involves Donald Trump as well as the mob.