Its muscovy. You can go to YouTube to listen to the different sounds they make. It looks old enough to be identified by sound. Also, if you take a pic of the side of the body while its standing - males have thicker legs and females are thinner.
Where did you get it? Did you get more than 1 duck? I would say it's less than a yr old.
Nice looking birds. If you take a pic of the muscovy so that we can see the whole body with a side view we can help narrow down if its male or female. The chicken might be a roo with those super long legs.
Is there anyway to ask the person who gave them to you about the ages? That also helps narrow things down.