日本では4/2から翌年の4/1が同い年になるって英語でなんて言うの？

「自分が2月生まれで相手が4月生まれで2ヶ月しか変わらないけど日本では学年が下になるので年下に感じる」＝ I was born in February and he/she was born in April so I'm only actually two months older but because the academic year in Japan starts in April, he/she is in the grade below so it feels like he/she is much younger. ボキャブラリー born ＝　生まれた February ＝　2月 April ＝　4月 only ＝　だけ actually　＝　実は、実際 two months ＝　2か月 older ＝　年上 academic year ＝　（新）学年 grade below ＝　学年が下 feels like he/she is much younger ＝　年下に感じる