I am thinking that 5 years is a bit much to expect from an egg laying hen. The egg layer breeds tend to lay like crazy, and then they are done and often times die around 3 years of age. I have a production red that has been a reliable layer all winter... but this is her third year. While she is quite active and laying and healthy, I would not be surprised to find her one morning.
As for the meat on an egg laying bird. A 3 -5 year old bird you will need to cook slow by simmering for hours or by pressure cooking. They will make very flavorful stock and soup, but they are NOT like KFC chicken. Egg laying birds just don't really have a lot of meat on them, and often people will just take the breast meat, and possibly the thighs.
You might be happier with a dual purpose bird, which are a little heavier, and lay a little less. Even so, they generally lay more than enough for a household.
In order to maximize your egg production consistency, you might not want to fill your coop/run the first year, as then you can add chickens the next year, then the third year, you would add chicks and begin to cull your older birds. Pullets tend to lay through the dark days of winter, where as older hens take a break. When they start up again in the spring, their eggs are bigger.
It is a wonderful hobby.
MRs K