It's a turning point in his life
turning point,通俗地讲,就是我们常说的“转折点、契机”。
如:After joining the company, my career has had a very smooth development. It seems that this job-hopping is a turning point for me(我来到新公司发展得不错, 看来这次跳槽是我的一个转折点)。
This is a turning point in history.(这是历史的转折点)。
在口语中,我们还经常用a big break来表示“大转折、大的突破”之意。
如:When the star was taken ill, the understudy finally got her first big break(主角生病的时候,那个候补演员终于得到了第一个露脸的机会)。