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It's not uncommon for healthy 7-year-old chickens to still be laying. If they stop early it means something is wrong. Could be something minor and non-life-threatening or it could mean they're quite ill.

Orpingtons seem to me to be one of those breeds that get "old" sooner. In other words, they tend to have reproductive problems early.

That is a pretty big difference! Chickens don't change gender, but they can develop more masculine features due to hormonal changes. It can be caused by a damaged ovary.