... Basically. [Ahsoka never considered Anakin to be that young when they first started training together. A nineteen year old seems impossibly old and wise to a fourteen year old. But now that she's nearly eighteen herself, she thinks Lance's words are pretty apt.

At the next question, though, her expression darkens.]

... Good question ... with a crappy answer.

The short version is that the Republic used a clone army to fight the Separatists.