Husbands porn history

My husband went to a friends party last night and ended up drinking and staying the night. I didn't go because I had work early the next morning... Anywho I cracked the code on one of his old phones and used my mobile hot spot for wifi to sneak a peak at his history while he was gone (sneaky, I know)... Well all the porn that he looks at is TEEN porn... All of the girls looked super young and barely legal and had TEEN right in the title. Teens masterbating, lesbian teens, blowjobs etc; I am also 8 years younger than my husband. Does he have some kind of sick attraction to young girls? Should I be concerned? Or is this normal?