Londoner Leo Alexander insisted that for some under-25s, housing benefit is "a necessity".
He left home at 18 due to family breakdown and said the money he receives goes straight towards subsidising the cost of the hostel he lives in.
"It's kind of like a lifeline for a young person who leaves home with things like family breakdown or suffering domestic abuse," he said.
George Osborne today said that he would "look at housing benefits for the under-25s."
"There are plenty of people listening to this programme who can’t afford to move out of their home, but there are people on benefits who can get housing benefit under the age of 25," he told BBC Radio 4.
More top news
David Browning said Jillian Howell screamed “you b******”, to which he replied: “I’m sorry Jill, this is what mental health does to you.”
Donald Trump is to visit the UK on July 13 and hold bilateral talks with Theresa May, Britain's ambassador to the US has said.
Ruth Davidson has announced that she and partner Jen Wilson are starting a family after successful IVF treatment.