The top one could be a Saxony and the bottom one could be a Magpie. They could also be cross-breed chickens.
The bottom one looks like it still has a little down, so I would guess somewhere between 8-12 weeks? I could be wrong, but that is around when they begin to molt into their adult plumage.
Top looks maybe like a buff and the bottom looks like a silver appleyard. Or both could be mixes. I can't say for the top duck other than 12+ weeks and up since it's fully feathered. The bottom I would guess around 8-9 weeks. Check out this link if you need help sexing them. http://www.majesticwaterfowl.org/artquacks.htm
The top one looks like a Buff to me and the other I would guess is a mix. Not sure about the ages the bottom one looks about 10 weeks. They're both beautiful birds though!