Neither is correct. You need: I have liked music since I was a child. I have liked music since my childhood.
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yzh1978Can I say " I have liked music from when I was a child"?You will be understood, but it's not completely idiomatic in my opinion. Use "since" instead of "from when".
yzh1978Or "i have liked music since when I was a child"?No. "since" already has the concept of "when", so the combination "since when" is a bit awkward there.