10（歳）代前半: early 10s 20（歳）代前半: early 20s [twenties] 40（歳）代前半: early 40s [forties] 50（歳）代前半: early 50s [fifties] 60（歳）代前半: early 60s [sixties] 70（歳）代前半: early 70s [seventies] 80（歳）代前半: early 80s [eighties] 90（歳）代前半: early 90s [nineties] 30代前半で: in one's early 30s [thirties]〔年齢が〕 30代前半に: in one's early 30s [thirties]〔年齢が〕 30代前半の女性: woman in her early thirties 30代前半の男性: man in his early thirties 30歳: thirty 10代前半: early teens 20代前半で: in one's early 20s [twenties]〔年齢が〕
