Finally, there is a quality action show (set in the 1940s) with a strong unobjectified female heroine. Peggy Carter, the show's protagonist, is the only female out of many men at her organization. Yet she fights for her spot at the table, and even confronts one of her defenders to say she can stand up for her self. However, due to the violence and target audience of the show, I'd say Agent Carter is good for ages 12 and up. There are many fist fights, and a few characters are shown with a bullet in their head.
UPDATED FOR SEASON TWO:
Agent Carter is back, and better than ever. The show, now set in L.A., is full of humor, action, and romance, the perfect blend. In terms of raciness:
There are some racial issues now, concerning treatment of African-Americans. This provides great opportunities to talk about the cultural difference seventy years can make.
Violence: people are getting shot. Peggy is almost strangled, and there are long, gruesome fist fights on screen. Early in the season, they visit a mortuary, and a corpse is shown. Be careful when allowing kids to watch this scene, although the special effects aren't great. There is a dark substance that the plot revolves around, and it is literally shattering people. The effects here are pretty life-like. This part of the show is not for kids. However, Agent Carter is still the best action show there is on ABC. Ages twelves and up should be just fine without supervision.