As old as they are you may never have ducks comfortable with human contact. they may come close to you, like mine do, but run away when you move toward them in any way. Also, like mine do.

If you get them young enough you can get them to imprint to you but then they think they are a human not a duck and may not get on well with other ducks nor feel safe and secure with ducks. So i personally don't recommend this. Just keep trying to get close and pick them up often. This will help them see pick ups are annoying but not necessarily bad. They will still complain. I also try to carry them to a place that is a neutral spot, i use a hallway personally. So they can see a way out. I sit them on the floor, hold them firm and do whatever medical, check up, inspection, medication, what have you, is needed then let them go always talking gently and in my good ducky voice. That i am sure they just L O V E.