the events of dark Frontier with the Hansen family started in 2353.
being born in 2349, that would make Kim 3 or 4 depending on the months in question
Seven was assimilated at the age of 6.
FRom point of departure to assimilation, was about 2 to three years?
they were exactly the same age physically.
You know except for all the time Seven spent in a maturation chamber ageing much faster than an ordinary human, and then all the time she spent with her development arrested... You know that she's had a seemingly 26 year old body since she was 10, and would have continued to have a seemingly 26 year old body for the next couple centuries, baring accidents.
Individuality decimated her life potential.
Was regeneration in the cargo bay arresting her development?
Is it possible that during those three years on Voyager that Seven of Nine wasn't ageing?
Icheb certainly looked older in Shattered.
But regeneration would probably be propelling him towards 26 like a de facto maturation chamber.
It's really a question of how much the Borg, and Unimatrix Zero prepared her mind to deal with an adult like Harry Kim.
If Seven did not want to sleep with Harry, then she outunderstood human psychology and human nature and a child like Harry easily by making him run from too much of what he only thought he wanted.
If Seven did want to sleep with harry, and that was her approach, then she is an idiot child.
But what else have the Borg learnt over the last 900 years, other than if they offer someone the best thing in the world, they will run.