Are men generally happier than women?

That's not true. How would you even be able to quantify that? Women are just more expressive when they are unhappy. Men tend to hold it in because it is not manly to express emotion. That is part of the scientific explanation of why women live longer in general than men. They don't build up stress from holding in emotional problems, and therefore don't have psychosomatic symptoms that lead to other medical problems.