Here you see Mars as he was thought of in the 2nd century AD (If I remember this correctly).
This is a modern copy of a statue from at Hadrianus villa, but it's a good representation of Ares as youth.
The Greek Ares, associated with the Roman god Mars, is very rare in sculpture and you're really lucky if you run into him. I could only find two examples; one at Hadrianus villa (Tivoli) and one at the Monte Martini museum at Rome. It is however easy to recognize the god when you see him, he's portrayed in arms as bearded in early art (archaic) and as a naked youth from the classical period and onwards.