"How old is [name]?" is the English phrase that can be used to ask a person's age. It is a simple and direct question that can be answered in different ways depending on the context. If you want to know someone's age, you can ask this question directly or use other methods to find out. However, it is important to remember that people may not always want to share their age or may have different ideas about what their age means. Therefore, it is always respectful to ask politely and avoid making assumptions or judgments based on someone's age.。