Do I need to be over 18 to open an account? May 03, 2019 12:48 Updated Follow You must be 18 years or over to open a HyperJar account. Related articles Do I have to live in the UK? Why did you ask me for extra documents? How do I change my address? Can I use my HyperJar card at a shop if I haven’t set up a Jar with them? How much does it cost? Comments 0 comments Please sign in to leave a comment.