How old do you have to be to ride the Eurostar chunnel?

Question by imbreakingdawn: How old do you have to be to ride the Eurostar chunnel?
I wanted to take the Eurostar from Paris to London. On the internet site it appears that you have to purchase at least a single “adult” ticket, but their adult age is 26+. So would an 18 year old not be able to ride it by themselves? Thank you for your help!

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