Life begins when あなた are conceived, and it begins again when あなた go to school, and when あなた go to high school, get married, have kids, ect. Life if full of new beginnings and endings, it starts and stops in different places, for different people
It depends. Physical life starts によって the moment of your birth. Life (like, living life) it starts when あなた decide taking control of it. Before that, everyone tells あなた what to do または bosses あなた around.
That's actually もっと見る of a ディベート 質問 and an overasked question. It's been asked so many times it could be called a whorestion. XD
But well, life begins when you're an organism. You're an organism when あなた breathe, communicate and grow. And since あなた can't breathe または communicate inside the uterus(because that'd be awkward) your life begins when you're born.
Also your(spiritual) life doesn't begin until あなた have a consciousness, which starts when you're a few years old I guess. または for the psycho's out there; never.