Every bird you ever raised reached 8 weeks = fryer age . Nothing to do with breed really . Back in the day my Great grandmother was in charge of the setting hens . She kept a steady supply of chicken for the table . No freezers or electric . Dual purpose breeds were the staple on most farms . Eggs , enough size for eating and broody for a steady supply of fried chicken . It took skill to have chicks hatch every 2 weeks or so . Small batches just enough for the family . If the family was large it took more chicken .Yep....I own my neophyte status!I actually don't have any fryers. Most of my birds are dual purpose (Orpingtons, Australorps, Ameraucanas, Cream Legbar, etc...). Some are smaller/skinnier birds (Starlight Green, Prairie Bluebells, Gamehens, Blue Andalusians, etc...). And of, course, I have barnyard mixes...although all my roosters are pretty big boys. I culled a roo last fall that was the size of a small turkey...no joke.
So none of my birds are fryers although I am very tempted to get some....ha ha. And I wouldn't say we NEVER get a tender bird.... We have had a couple which were very tender and succulent. DH usually grills them. Sometimes he can overcook them which, naturally, makes them like hardtack almost. But I'd say 60-75% of the time, they seem tougher than I'd like.