Enjoying life isn't a matter of age. Regardless of a person's age, enjoy life is a matter of perspective; someone can be really sad whichever circumstances he is living. Someone that has less wealth and less family support or social life, can be more happy that a person who "has a god life." And this could be just for the social environment or the previous experiences of a person. In our society a teenager usually has an environment in which social interaction is frequent, thus he has the possibility to find great friends, and at the same time, as students, teenagers have more time for fun, but less freedom for do whatever they want. At mid age, adults oftenly have a lot of work to do, and great responsibilities, in this way, it could be a little bit more stressful life. An adult have to care for other persons, therefore have less time at disposal for joy, but, at the same time they have money and freedom. When old, people have a lot of time at hand, but possibly they will not be as healty as young ones, so they could be limited for travel or do different things that will give their joy. As it can be seen in all ages people have different benefits and maybe disadvantages regarding the possibility of happiness and joy. And is important to note that human beings have pretty different lives, and moreover different forms of approach problems. And at the same time people have different ideas of what joy mean or happiness. So I think that age isn't a condition to be happy or not. It's more the way a person approach each day, what makes him enjoy life or not.