Zane is examining two studies involving how different generations classify specified times as either luxuries or necessities. In the fist study, generation A is defined to be people ages 12-23. The second study defined generation A to be people of ages 16-27. Zane notices that the first study was conducted in 2004 while the second one was conducted in 2008. (a) Are the two studies inconsistent in their description of generation A?

(b) According to the 2004 study, what are the birth years of generation A.