thank you everybody for your replies -- there is certainly a lot to think about.
Although I do not cherish the idea of having the birds butchered, I also don't care for the birds to grow old and frail, possibly sick and eventually die on their own either, especially with the chicken pecking order, etc.
For now, I have come to prefer the solution of having the birds killed on site (to avoid relocation stress) by somebody who really knows what they are doing (quick and efficient - minimal suffering). Thanks joebryant, my husband and I truly love the idea of donating the meat to the food pantry. Alas, we ourselves were in need of food pantry trips when hubby was out of a job and times were truly rough, so we cherish the idea of contributing. We had already discussed dropping off some eggs each week in any case.
As I grew up on my parent's little (hobby) farm where we grew animals for meat (chickens, turkeys, rabbits, sheep, beef, ...), I am familiar with the not-a-pet concept. It's hard sometimes, but it's the reality.
I start to feel quite comfortable with this "retirement" plan actually. Thanks everyone for your feedback! If you have any further ideas, I'd love to hear it.
Much obliged,
/C