Essentially a B-movie with A-list actors.
Plummer and McClain are overkill for this film which is not especially funny or dramatic. It's like trying to combine Grumpy Old Men with Brian's Song and neither the story nor the casting work.
James Brolin and George Segal both are a treat in their small roles. These older actors have unbelievable presence and they command the screen, which makes the film kind of worth watching.
It's unfortunate, though, that Hollywood has not produced a credible story about romance and sexuality between older adults. Good Luck to You, Leo Grande, is a recent example of a film that should have been brilliant dealing with this topic but fell quite short. It's Complicated did a fair job but that, too, should have been much better.