Who is eligible for a Junior ISA?
Your child is eligible for a Junior ISA if they’re under the age of 18, and resident in the UK. You can also open a Junior ISA for your child if you are a crown employee serving overseas.
If they hold a Child Trust Fund (CTF), you can only open a Junior ISA for them if you transfer the CTF to their Junior ISA as part of the application process.
Once your child turns 18, you can't transfer their CTF to a Junior ISA. Instead, they could choose to transfer it to a Stocks and shares ISA or Lifetime ISA. More about transferring a matured Child Trust Fund.