User blog comment:EvanDude345rv5/Fairy Tail 344: Erza is a child again, WTF ?/@comment-7418318-20130719193322

Last Ages only makes the caster older, while turning back the time for the "targets". Erza is clearly not the one who cast that spell, so for her it's pretty much the same as Last Ages, only stronger or rather more concentrated (rather than turning everyone back 1 min, it only turned her back, but for several years).