When answering this question, you can compare the habits and purposes of mobile phone use between young and old people. Young people often use mobile phones for social networking, entertainment, gaming, and accessing information quickly. They are usually more comfortable with new apps and technologies. In contrast, older people may use mobile phones mainly for making calls, sending messages, and sometimes for basic internet browsing or using simple apps. You can also mention that older people might be less interested in social media or gaming, and may face more challenges adapting to new technology. Giving specific examples of typical activities for each age group can make your answer more convincing.