Younger borrowers use mortgage brokers much more than older borrowers and this may contribute to them taking on more debt than they can comfortably afford.

More than two out five of borrowers aged 28 to 42 used a mortgage broker to obtain their current loan, based on the 5634 respondents to a Roy Morgan survey who've bought in the past five years.

Just over a quarter of Baby Boomers, those aged between about 58 to 72, used a mortgage broker with the vast majority going directly to the lender.

Younger people have grown-up with mortgage brokers as part of the landscape and likely see it a familiar way of finding a home loan.