Bf thinks celeb way younger than both of us is attractive

My 31 year old bf has mentioned a few times, 1 in convo, and others randomly how he thinks Millie Bobby Brown is pretty attractive and cute…I started to pick it up after a while and never said anything but found it odd…? like sir she JUST turned 20. Like yeah she’s cute, but to me she’s still a “little girl” probs cuz she was in Stranger Things when it came out. Anyways, does him having a supposed celebrity crush on a girl 11 years younger odd to you? I should mention I am 28 and couldn’t imagine thinking some 18-19 actor or whoever is attractive/cute. To me it seems borderline predatory? Idk 🤷🏼‍♀️