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Nekovalkyrja (pronounced “Nay-ko-wul-ku-ree”) are the cat-eared clone soldiers of the Yamatai Star Empire. It is common for them to be be referred to as “nekos.”
All Nekovalkyrja citizens of Yamatai, regardless of their origin, are subject to a mandatory 3 years of military service in the Star Army of Yamatai, or the equivalent in direct service to the Yamataian government.
If you're interested in playing a Nekovalkyrja character, see Creating a Nekovalkyrja Character.
The idea of a generation is human concept that doesn't apply neatly to Nekovalkyrja because they can produce at a young age, and (as you noted) they are a very young race in general, with Nekovalkyrja not even being heavily mass-produced until somewhere around YE 20, meaning most Nekovalkyrja are younger than 15. If I had to break down Nekovalkyrja into generations, it would be by model numbers or by the wars they were produced for.
The nh-33 model is the most common, followed by the nh-29 and the nh-27. The nh-28_niws is uncommon but still in limited service. All other nekos are either extremely rare or obsolete and replaced.
Originally, the Nekovalkyrja series was developed by pnugen_corporation for the Uesureyan Empire. Later, Nekovalkyrja production was assumed by the ketsurui_zaibatsu.