Since you have too many does, shoot everyone you can regardless of wether they have fawns or not. In most states, once hunting season is open fawns no longer need their mothers to survive.

IMO Goliath is probably 2 1/2, but it's a little hard to be certain from the camera angle. The little 4 pt is 1 1/2. I can't tell about the age of the doe from the picture but my guess is probably 2 1/2 or maybe 3 1/2 since these are her 1st set of twins.