What is happiness? Is it brain chemistry? Is it some random cluster of neurons that fire in the right sequence to give us this illusion? or is it something we have to perceive or believe in to be real. I don't really know but I do know that a true state of happiness is pretty fleeting most of the time. People that profess to be happy all the time make we wonder, are they really happy or is it what they choose to believe.
I know that little kids are generally happy and often very old people are happy. Maybe because they don't have to fight the fight of life. Adults scurry around with all the adult worries and responsibilities. Kids and old people just play. It is something we seem to always be striving for yet I don't think we even know how to accurately define it. It is an odd illusion.