What does "in" refer to here? Should I put "in" front of age?
Native speaker’s answer
Rebecca
Yes, "in" is often used when referring to a specific age range (decades), such as the "seventies" referred to in this video. It can also be used to refer to a specific decade or time period. Ex: My grandparents are in their sixties. Ex: I am in my mid-twenties. Ex: I love the rock 'n roll of the eighties. Ex: My parents married in the 1980s.