When answering this question, you can compare the types of activities, energy levels, and interests of young and old people. Young people often prefer more active and social activities, like playing sports, going to the gym, hanging out with friends, or playing video games. In contrast, older people might enjoy quieter and more relaxing activities, such as gardening, reading, walking, or spending time with family. You can also mention that technology plays a bigger role in young people's free time, while older people might stick to more traditional hobbies. Giving examples from your own experience or people you know can make your answer more natural and convincing.