here are the results on flathead age from northern indiana water. 21.5 inch flathead: 5yrs. 23.5 inch flathead: 5yrs. 24.0 inch flathead: 9yrs. 28.5 inch flathead: 11yrs sorry i wasnt goin to kill any bigger fish to donate for the study. but as i see it i wont be eating anything over 5 yrs old. i dont eat many of them anyhow cause of the polution in our waters. maybe this year i can get a toxicology test done on some meat,if so ill pass it along too.