Can you hatch eggs from older chickens?

Have you tried incubating eggs from young hens (1-2 years) old as a comparison? If not, I'd recommend doing this so you can see whether the issue may be related to the incubator rather than eggs from the older hens.

That being said, fertility and hatch rate are lower with eggs from older hens. The hens themselves are less fertile and the eggs are less than optimal for the developing chicks. For example, the thin shells have less calcium and minerals for the developing chicks, who draw needed nutrients from the yolk, albumen and shell.

 

I'm interested in opinions too. I have had older silkies and cochin silkie crosses lay and hatch out chicks that are fine. I have some older 3&4 year old Wheaten Ameraucana hens and a year old lavender wheaten rooster that I would love to breed in late spring. I plan on feeding them higher protein breeder feed and probiotics to get them in good shape at the end of winter. The ladies laid well this year but had illness and molt for last two months. They look really good now, are still off lay from fowl pox, but they are recovering very well. The rooster had a light case of pox and is in fabulous shape. All of my roosters are under 2. Shld I wait for my unproven pullets to reach breeding shape or use my 3 beauties? I plan on it anyway because they are still so well mannered and beautiful.

 

NWFL: How is the quality of the eggs? If the shells are nice and solid, if the eggs are not overly large (IMO, those jumbo eggs don't hatch well.) it would be worth a go, b/c you want to preserve the genetics of these girls. Nothing ventured, nothing gained.

You might try dropping your humidity. Is your bator still air or forced air? Do your hens have access to acorns? Those can make the yolks black. It the eggs are soft (shells?) or even membranes, that will definitely affect your hatch. Membrane quality tends to decrease with age of the hen.