The Golden Honeymoon(1980)

Charley Tate is an old windbag, often a braggart, but somehow always lovable. Married over fifty years to his ever-patient wife Lucy, the two of them are on their Golden Honeymoon in Florida. Everything goes perfectly... until Lucy meets her former fiancee who's also vacationing with his wife. Suddenly there's a comic competition between Charley and the old boyfriend for Lucy's attention. After fifty years, cantankerous Charley has to win his girl all over again!