Graham explained to me that this relationship is fairly universal -- it shows up across countries, across generations, and even among apes. But there's some bad news in here for millennials -- as if coming of age in the worst job market in modern memory wasn't enough, statistically speaking the worst is still far ahead of them. The happiness curve for the United States bottoms out at about age 47. This means that for the average 25-year-old, life will continually become worse over the next two decades before things finally start to turn around. You think you're having a bad today? Remember the immortal words of Homer Simpson: "This isn't the worst day of your life -- this is only the worst day of your life so far."
But American millennials can at least be thankful that they don't live in Russia. Graham provided me with data on the happiness curves for various countries, which are plotted below. One important caveat -- these charts only look at the relationship between age and happiness within countries. Happiness values are relative, and cannot be compared between countries.
In most countries, the happiness curve bottoms out somewhere around middle age -- 47 in the United States and 41 in Britain, for instance. This usually happens long before the average person is expected to die, with one major exception: Russia. In Russia the curve doesn't bottom out until age 91. Essentially, life under Putin is one continuous downward spiral into despair.
At least American millennials can expect life to get better for three full decades after they hit rock bottom. In Russia, the only thing to look forward to is death's sweet embrace.