You sed: "you" don't look like "you" did 10 years ago, or will look like in another 10. "you" became "you" at the moment of conception.
Certainly my genotype was established. But my point is that 'life' preceded conception. I was born through the union of two living cells contributed by two living parents. Life did not begin, it was recombined and extended. You could argue that "a life begins at conception", but without the qualifier the statement is false.
All life started with God who created us.