When answering this question, you can compare the reasons why younger and older people might smile more. For example, you could say that children and young people tend to smile more because they are carefree, easily amused, and less burdened by responsibilities. On the other hand, older people might smile less due to stress, life challenges, or health issues, but some older people may smile more because they have learned to appreciate life and find joy in small things. You can also mention that smiling habits can vary depending on personality and cultural background.

回答这个问题时，你可以比较年轻人和年长者微笑较多的原因。例如，你可以说儿童和年轻人往往因为无忧无虑、容易被逗乐以及负担较轻而更多地微笑。另一方面，年长者可能因为压力、生活挑战或健康问题而微笑较少，但有些年长者可能因为学会了欣赏生活并在小事中找到快乐而微笑更多。你还可以提到，微笑的习惯可能因性格和文化背景的不同而有所变化。