Question

I (practise/have practised) instrumental music (since /for) I was ten years old.​

Answer 1

answer is - have practiced , since

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Answer 2

Explanation:

$\huge\mathtt\purple{A~N~S~W~E~R☬}$

I have practiced instrumental music since I was ten years old.

**For a particular period in the past we always use the pas perfect tense.