The Sky Crawlers (2008) on DVD

Anime News Network: "Kannami Yuichi is a "Kildren", a fighter pilot recently sent to Urisu Base to replace a previous one who had died in battle. Like the numerous genetically-engineered pilots before him, he does not age, only to live his life fighting and eventually dying in battle. Rostock and Lautern, 2 different companies have been engaged in a brutal war that has no beginning or end, rather the battles they create serve to "entertain" the peacetime people. Yuichi befriends the base commander, Kusanagi Suito, a woman who endures a long dark past. As their relationship grows, Yuichi learns the bittersweet moments of life, and the inescapable fate he has been placed in.errorsource

The story unfolds in another 'possible' modern age. The main characters are youngsters called "Kildren", who are destined to live eternally in their adolescence. The Kildren are conscious that every day could be the last, because they fight a "war as entertainment" organized and operated by adults. But as they embrace the reality they are faced with, they live their day-to-day lives to the full."

This was visually stunning to watch, but I got a little lost in the storyline.