The Importance of Happiness

At what age can you start to be happy or is it just something which people can say about you when you're dead? That is a important question about which Aristotle agonizes. He acknowledges that however successful you may be in your life, everything may crumble. So he's strongly tempted on the one hand to echo a saying of the Greek statesman poet Solon call no one happy until they're dead. But on the other hand typically he thinks that's crazy and non-common sensical.