Young people risk missing their chance to vote unless they register quickly, the Electoral Commission has warned.
It says one in three young people are not registered to vote, and urges them to sign up before the deadline on 26 November.
The commission's research shows only 74% of 25-34 year-olds are registered, falling to 68% among those aged 20-24 and 66% among those aged 18-19.
Registration rates are much higher for those aged 65 and over, at 94%.
But it says registration is quick and easy and can be done online at www.gov.uk/registertovote, and anyone who won’t be able to get to their polling station on 12 December can arrange either a postal or proxy vote.
The commission's Craig Westwood said: 'It only takes five minutes to register to vote online – time that you might otherwise spend waiting for the kettle to boil or for a gym class to start.
'So if you want to make sure your voice is heard, go online and register now.'