What do psychologists consider the single most reliable indicator of happiness?

• money
  Even though 48 percent of marriages end in divorce these days, marriage is still the best gauge of happiness.
• children
  Even though 48 percent of marriages end in divorce these days, marriage is still the best gauge of happiness.
• marriage
  Even though 48 percent of marriages end in divorce these days, marriage is still the best gauge of happiness.
• religion
  Even though 48 percent of marriages end in divorce these days, marriage is still the best gauge of happiness.
• leisure time
  Even though 48 percent of marriages end in divorce these days, marriage is still the best gauge of happiness.