Jon Hamm thinks 'Mad Men' should end after its seventh season.

The popular advertising TV drama, which is centred on a 1960s agency and also stars January Jones and Christina Hendricks, has recently been renewed for three more seasons bringing it up to a total of seven and Jon thinks the show will have run its course by then.

He said: "I think it should end [after the seventh season]. Everything should end. I was a big fan of 'The Office' over here because it ended."

However, Jon - who is currently starring in the movie 'Bridesmaids' - admits he is extremely grateful for the success the show has brought him.

He told radio news segment BBC Newsbeat: "I'm 40, which is ridiculously old in Hollywood. I mean, come on, I'm not in 'Twilight'. I could play their grandfather or something. It's crazy that this has happened. I'm a very, very lucky human being."

Jon will star shooting season five of 'Mad Men' in "late July or August" but he has no idea what to expect for his character Don Draper.

He explained: "I don't think [the scripts] exist. The way Matthew [Weiner] writes the show is very organically. He starts when he starts and eventually there are scripts but I certainly haven't seen them."