Martin Lewis warned that millions in the UK aged between 12 and 20 years could have more than £1,000 lying in a "dormant" savings account.
The Money Saving Expert highlighted the problem in his recent Martin Lewis Money Show episode and urged people to investigate.
He told his viewers that if they were born between September 1 2002 and January 2 2011, or have a child who was, they could have cash saved into a Child Trust Fund (CTF).
