It should make you happy with the present, though, if you use the past and the future as the baseline for comparison. As John Derbyshire once said in a different context, "We are living in a golden age. The past was pretty awful; the future will be far worse. Enjoy!"
Now I'm confused, how's other people being even worse of supposed to make me feel better?
From Mike Darwn's Chronopause, an essay titled "Would You Like Another Plate of This?", discussing people's attitudes to life:
Conclusion, graphs, and references in article. As usual, I recommend reading Chronopause.com as Darwin has many good articles; to quickly link a few: