Read Forty Niners, everything will makes sense
See, the thing is, Wulf finally met Steve when Wulf was 24 and Steve 16, in Neopolis...however, Wulf showed him the old film wheel from back in the war when Steve was 11, and in the film, a 'Jerry Jezebel' was giving him the eye even though she's 'old enough to be his Auntie'! Wulf then points out that plenty of women, and men, in the cinema, was giving Steve the eye, because Steve looks great.
There are...different sets of dates for, when it's alright to notice someone is cut,e when it's alright to notice someone is sexy, when it's alright to date, when it's alright to have sex, and when it's alright to throw the gloves off.
Like, me personally, it's alright for me to enjoy how pretty anyone who has hit puberty looks like, but I refuse to date anyone under 18, and I refuse to have sex with them unless they are over 20, or over 16 and already has had several HEALTHY sexual relationships before moi.
Everyone have different rules regarding the dates about this, the important thing is, /no harm/. Wulf and Steve is definitely different because they BOTH loved each other, so there is consent. In regards to the age note, they lived in earlier times when people die earlier, and yes he was eleven in the film, but he was already killing people (what happens when you shoot down planes?), AND noticing how good he looked in the film aside, Wulf didn't approach him until he was 16, with caution.
I noticed older women when I was...twelve, and I was already flirting with them then, in the sucking up to the pretty English teacher in class sense, of course it would have been harmful if I started sleeping with people THEN! But flirting is alright.