Not answering. You need to re-visit the survey I'm afraid; there's no ethics consideration. How are you using the data? What's it actually for?
You're asking the age of under 18's here. That requires ethical clearance and you've got no ethics statement. At that point the survey's in the bin.
Most of the questions have dichotomous yes/no answers when in reality it's an in-between Likert scale of frequency/preferences/etc.
The questions need re-visiting throughout; i.e. if I'm aged 5 how can I have kids? Should I even be answering? How many children could I have? Your age option has one choice only and I might have them across all ages. And that's just the start ... Otherwise your data set is entirely flawed and, if you're using this for a qualification, you have a problem when you submit the data as part of your findings, analysis and recommendations.
That doesn't matter whether it's for GCSE / BTEC / A-level or, hopefully not, university level undergraduate/postgraduate. It means all of your analysis based upon the questionnaire becomes irrelevant at best, incorrect and fail-able at worst. If any of my university students tried to present this I'd have spent significant time discussing with them how to make it more effective. And we'd have got it correct, presented it for ethical clearance and then stated that here.
If this questionnaire's been signed off by your tutor they need to resign. Or at least recognise they shouldn't be teaching you. Sorry, but it's awful.