Golden Comets- How long is their lifespan and do they get along with other breeds?

I can't speak to the lifespan or production life as my two are only 7 months old but I have a mixed flock with both buff orps and barred rocks and well one of my girls holds her own pretty well the other is probably near bottom of the pecking order. They are awesome egg machines though adding that boost of production right beside your heritage/dual purpose breeds. One of my Comets was laying at 14.5 weeks of age and hasn't missed a beat. My barred rocks are awesome foragers compared to the comets who prefer to hang out and the feed trough the buffs seem to get along well with all the hens. I have easter eggers also but mostly for novelty as the kids enjoy the green shelled eggs. My next flock will definitely include a few more comets and maybe some black sex links as well.