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Theresa May was today warned that Brexit will “betray an entire generation of young people” as a new poll showed teenagers who have now gained the vote back staying in the EU by more than five to one.

The YouGov survey found that 84 per cent of 18, 19 and 20-year-olds — too young to take part in the June 2016 referendum — support remaining in the European Union, with just 16 per cent opting for Leave.

People aged 20 to 24 who were able to take part in the Brexit referendum voted by three to one to Remain.

The analysis suggested the Leave majority of 2016 would be wiped out in January 2019, two months before the UK is due to quit the EU. The calculations were also based on elderly people, who mostly voted for Leave, dying. If Brexit happens:

63 per cent of voters aged between 18 and 20 think the economy will be weaker, seven per cent think it will be stronger.

58 per cent think that the NHS will get worse, nine per cent that it will improve.

57 per cent think that “today’s children” will be worse off than their parents’ generation, 12 per cent better off.

54 per cent feel opportunities for people like them will decrease, ten per cent that they will increase.

Student Kira Milana Lewis, 18, said: “Opportunities for young people are limited, and everything points towards Brexit making that worse.”

Omar Shire, 18, said: “It was possibly pensioners who were voting Leave the most. I would say our opinion outweighs theirs.”

The poll was for the People’s Vote campaign, which wants a vote on the outcome of the Brexit negotiations.