One reason kids shouldn't play tackle football is that it can cause memory and thinking problems later in life.For example, an average 240 head impacts in a single season for kids ages 9-12."We are all questioning what the impact of recurrent head impacts the young brain," said Dr. Brooke Pengel, medical director of the Rocky Mountain Youth Sports Medicine Institute.Also, playiing tackle football before the age of 12 is associated qith an increased risk of developing memory and thinking problems according to Nuerology.org.In addition, Neurology.org tested two groups of former football players, half who played football before 12 , half who played at and after 12.Those who played at or after 12 scored higher than the other group, both cored…