Tarantino has made various claims about retiring after finishing his 10th film.

From https://www.hollywoodreporter.com/movies/movie-news/quentin-tarantino-sets-the-movie-critic-final-movie-1235351260/:
"The filmmaker has long maintained he had a finite number of movies in him, saying he wanted to direct 10 films or retire by the time he was 60. The writer-director has made nine (if you count the two Kill Bill movies as one) and turns 60 later this month."

Resolves YES if he ever directs an 11th feature length narrative film.

Note that Tarantino considers Kill Bill: Volume 1 and 2 to count together as one movie, so his 1st movie is Reservoir Dogs, and his most recent, Once Upon a Time in Hollywood, is 9th.