A great film from one of the greatest filmmakers who ever lived. Forget the crap about this movie not being "appropriate" for anybody under the age of thirteen because if you have a kid below that age who likes subtitles and and action adventure movies they are going to love this. The movie is very understated in it's content, even it's violence is subdued, So there shouldn't be a problem for anybody under the age 13 seeing the drinking or the violence because 1) it was part of the culture the movie depicts and 2) the movie's not telling children to go out and drink or do violent things. Children would be seeing much worse if you let watch either Transformers movie.
A pinnacle of Japanese cinema, Seven Samurai saw the birth of the historical epic genre, and is an amazing movie in it's own right.
Kids may have issue sitting through this 3 and a half hour black and white, subtitled movie. But those who invest their time will come away with quite an experience.