UPDATE (April 12, 2017) – Netflix has now confirmed the Season 4 renewal.
Netflix has renewed Grace and Frankie for Season 4, with filming already underway on the next chapter of the series. Co-creator Marta Kauffman told Deadline:
Well, Season 4 is dealing with the real process of aging in terms of what happens to us. By that I mean, not just in the world but also within our own bodies and how that affects our independence.