This study was carried out with the aim of determining the effects of breeder age on incubation results, intestinal development during hatch window, chick quality and first week broiler performance. A total of 4800 eggs were obtained from commercial Cobb 500 broiler breeder flocks at 33 and 62 weeks old. Of these 33 and 62 weeks old flocks, 31.4% and 7.0% were hatched 24 h before pull time and 51.2% and 56.0% were hatched 12 h before pull time, respectively. Hatchability of fertile eggs and hatchability of total eggs were found higher in 33 weeks old flock than the other. The chick hatch weight was determined as 39.5 g and 41.4 g in 33 and 62 weeks old flocks, respectively. Chick weight/initial egg weight rate was found to be higher as 67.3% in the 33 weeks old flocks. On hatching day, chick length were also higher in 62 weeks old flock. Relative yolk-free chick weight was higher in 33 weeks old (85.0%) flock than the other (82.0%). Intestine weight rate was higher as 5.27% in chicks from 33 weeks old than the other (5.08%). At 1 week of age, the body weights and weight gains were 165.1 g and 156.0 g, and 125.6 g and 114.6 g in 33 and 62 weeks old flocks, respectively. Higher mortality ratio as 3.6% was observed in 62 weeks old flock. In conclusion, intestinal development during hatch window, incubation parameters, chick quality and first week broiler performance is affected by breeder age.