Around what age do most people get married in your country?
What's the average age for people to get married where you're from?
ーAround what age do most people get married in your country?
「あなたの国では、たいていの人は何歳くらいで結婚するの？」
Around what age do most people ~? 「たいていの人は何歳くらいで〜しますか？」
ーWhat's the average age for people to get married where you're from?
「あなたの出身地では結婚する平均年齢は何歳ですか？」
What's the average age for people to ~? で「〜の平均年齢は何歳ですか？」
ご参考まで！
カナダ 
