Question: Do you have a hobby that you've had since childhood?
1. Answer whether you have a hobby that you have kept since you were a child.
2. You can mention what the hobby is and explain why you have continued with it for so long, or how it has influenced your life.
Try these synonyms instead of repeating the question:
hobby→pastime; interest; leisure activity
since childhood→from a young age; ever since I was little; when I was a child