10 years old is not prepubescent. Wrongly calling attraction to pubescent girls (usually called hebephilia) "pedophilia" is a feminist tactic meant to demonize normal male sexuality.
Nobody IRL looks like manga/anime chars. What specifically are you getting at here?
Closest example I can think of, since I barely follow IRL tv anymore, is Ariel Winter (born 98) was probably 10 when filming season 1 of Modern Family (debut 2009).
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I didn't watch the show back then, my first awareness of her was when she showed up on Monday Night Raw to promote Trips' new film when she was 13:
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I'll admit the older version is more sexually appealing than the younger version, but the younger version is still adorable and it would be great to do non-sexual romantic girlfriend stuff like handholding with her.
That has to be judged on a case-by-case basis. It's genetic bone structure as much as it is puberty changes when it comes to form.
They literally put Brooke Shields' glutes up in museums in the 80s:
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for comparison, I've shown after it Brooke in 2005 at 40 years old posing in "Spiritual America 4", a tribute to Richard Prince's interpretation of Gary Gross's original series.