Wealthy, self-made Gunther Schmidt is celebrating his 60th birthday in style: with 60 guests. But Gunther doesn't like being 60. As he casts his eye over the assembled guests, he spots the luscious Linda, girlfriend of the mayor's son—and just the one to keep him young. So when he goes to bed that night, he resolves to get rid of his boring wife Marion and have Linda instead. But Gunther hasn't bargained for what Linda and Marion think of the matter.