This is not a "great film" in the filmic sense, but I loved it all the same.
First, it is great to see films like this getting made at all! The last time I saw something comparable with a mature cast was "The Leisure Seeker" and that was a few years ago. This gets extra marks because it is so good to see!
Second, what a cast! Seeing Burstyn performing at such an incredible level at almost 90 is so inspiring. The cast is uniformly excellent, imbuing the characters with so much more than what is merely delivered thru dialogue. There is a great scene of conflict between Burstyn and Curtin that doesn't even include any dialogue - it is all in their body language and expressions, so wonderfully unstated.
It's fairly light fare compared to Burstyn and Caan's body of work, but it is very well crafted, and is a joy to watch as a result. So nice to see a character driven film featuring older characters, reminding us that character development doesn't end!
I would recommend this to all but the most cynical.