White works well with most apps, and web browsing. (things that have mostly white backgrounds.)
Black works well with video, especially letterboxed 16:9 video (as the black bars kind of fade into the frame.)
Both models are gender neutral.
Oh, and I first thought you were talking about an 18 year old iPad. Honestly, if you find an 18 year old iPad 2 -- check the Stock Market APP. You could probably get rich. Just invest and wait for 17 and 3/4 years, because an 18 year old iPad 2 would have to be from the future... 😎