The phrase "How old is he?" is an English question asking about someone's age. The usual answer to this question is a statement of the person's age, for example, "He is 12 years old" or "He's twelve." It translates to Russian as "Сколько ему лет?" which means "How many years does he have?" or simply "How old is he?" in English.
The question itself does not specify any individual, so without further context on who "he" refers to, it is not possible to determine a precise age. The answer depends entirely on the individual in question. If you provide more context about who "he" is, the specific age could be found or estimated.
