Put Another Candle on Your Birthday Cake People past their 60th birthday tend to grow happier, according to studies that found that older people shown pictures of faces or situations remember the happier ones more than the negative ones. Being grateful is one of the simplest ways to foster happiness. In one study, researchers found that listing three good things that happened during the day—no matter how small—increased happiness and decreased depressive symptoms. So take a few minutes each day to think about good things that happened. Either write them down or enter them into an app such as Happier or Te Gratitude Habit.