What is "this? I didn't notice anything in the picture.
I will say that IME bantam hens live much longer, with far fewer problems than LF. But even LF can live a long time and even keep laying. About 10 years ago, when I was in high school we ordered chicks from McMurray and they became major pets. Now, out of the original 25 my Mom still has 7 of them: 2 D'uccles, 1 Sebright, 1 frizzled cochin bantam, SL Polish, 1 SL Wyandotte, and 1 EE. In fact, the only bantams from that batch of chicks that have died did not die of natural causes. Some of these chickens haven't layed in years and years, like thr SL Wyandotte, but a D'uccle and the EE were still laying regularly last year!
That said, we did find a lot of the hens were weeded out around 4-6 years old from egg laying problems, especially breeds bred for high production. Then around 6-9 several (mostly large breeds like Brahmas, Delaware, and Cochin) died for no apparent reason, l think their hearts just stopped.
One of the D'uccles is blind (who knew chickens got cataracts?!), and the Polish recently got crippled when a predator took another hen (from that same 10 year old batch), so they do live away from the rest of the flock and I am not sure they would be able to make it with the others if my Mom didn't take special care of them. The rest live with the younger chickens and just keep ticking; they seem active and healthy. I was just out visiting my parents a few days ago and the bantam Cochin and EE came up wanting to be held!
So they definitely can have a good life after they finish laying. You'll be able to tell when something is wrong with them if you're observant.