One of the girls on campus was 20, but she was what used to be described as a midget (not a dwarf). Technically, she had proportionate dwarfism, with no deformities of the body.
A "homunculus," a perfectly proportioned small person.
(thank you big bang theory)
A beaker full of death wrote:
Yeah, the puberty thing is big. In truth, she would NOT be the same person emotionally, because her hormones would be so different.
There's also the likelihood that Keiko had a intact hymen again, and so would physically "lose" her virginity to Miles.