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
Tom Webb, 22, died after receiving a single stab wound to the chest on January 19 this year.
In the run-up to the Rio Olympic Games, ITV News speaks to four Olympic hopefuls in Team GB. Today we profile BMX rider Liam Phillips.
The 36-year-old has not been seen or heard from since Thursday evening.