Our oldest is "Oscar" - for Oscar from Sesame street. He is probably about 10 this year. He is a Barred rock mix and who knows what. He has thrown some very interesting chicks over the years. One day he just showed up at the house under the bird feeder. His comb and wattles had been freshly dubbed so we figured he was going to be fought. He is retired now, doesn't mate much, just sort of does his own thing. He has 2 older hens that hang out with him, when another rooster mates them he doesn't even try to fight them off.
We haven't done anything extra special with him over the years. In the afternoons when we are feeding he is usually the first one to go in the house so I will feed him a handfull of corn or some treat.
Steve in NC