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used to say that a person's age is not solely determined by the number of years they have lived, but by their physical and mental state
一个人感觉自己有多老就有多老
used to imply that as a person ages, they become more childlike in their behavior and needs, emphasizing the importance of treating the elderly with care and respect
老人是小孩的两倍
used to suggest that someone who achieves success or matures too quickly or too early in life may also experience a decline or downfall earlier than others
used to imply that as a person reaches middle age, they either gain wisdom and expertise from their experiences or remain foolish due to their inability to learn from mistakes
每个人到了四十岁要么是傻瓜，要么是医生
used to suggest that the second half of life can be as rewarding as the first, as the age of forty allows more time and resources to focus on personal interests
used to suggest that customs, behavior, and social norms change over time, and what is acceptable or expected in one era or culture may not be in another
其他时间，其他礼仪
used to suggest that even though something or someone may be old and worn out, they can still be effective and have value
有很多好听的曲子是用旧小提琴演奏的
used to imply that young people should be given opportunities to grow, learn, and express themselves while being treated with patience and understanding to nurture their potential
必须为年轻人服务
