中年是指多大啊。 这句话英语怎么说啊，答案是什么啊？

how old did you mean by middle age? 这句是“中年是指多大”的翻译，
根据正常的习惯，答案应该是40-55岁之间吧，i guess it's age between 40 and 55

how old is person of middle age ?
大概是35-50岁吧

what is the age span of middle age？
probably 40-60

Which exact age stage is referred as ' middle age'?

How old exactly does 'middle-aged' mean?