Blue 1999, was 6 years old and shared the gameboy with older siblings. Didn't finish, but did beat Yellow a year or so later when they lost interest in Pokemon.
Johto and Unova, plan on playing them soon since this board insists HG/SS and Gen 5 are the peak of the series.
Yes. Upset by lack of gambling, actual Safari Zone, no abilities and paywalled Mew, but everything else about it is better than I expected.