It should be noted that, when you compare the descriptions of Spartan military education with modern studies of child soldiers, you realize that's exactly what Sparta was: a society of child soldiers. It's the same procedures of indoctrination and ritual initiation. You want to extol their military life, go to the Lord's Resistance Army or similar counterparts today.
Strip away the romanticism of Sparta, and you're left with a slave society whose military is based on child soldiers that struggles to fight battles next door, which is curb-stomped by next major military force to sweep in (the Macedonians), produced nothing of note in lasting cultural artifacts... but has the best publicists of the ancient world!