Factors that don't correlate much with happiness include: age,3 gender,4 parenthood,5 intelligence,6 physical >attractiveness,7 and money8 (as long as you're above the poverty line). Factors that correlate moderately with happiness >include: health,9 social activity,10 and religiosity.11 Factors that correlate strongly with happiness include: genetics,12 >love >and relationship satisfaction,13 and work satisfaction.14

Factors not within a human's control: age, gender, intelligence, money. genetics.

Factors that are within a human's control: parenthood, health, social activity, religiosity relationship satisfaction, work satisfaction.

factors that are sort of within human control: Parenthood Physical attractiveness Love

By this thinking - a lot of what creates happiness is within our control (or probable control).