It is definitely relative to where you live and the population. A town full of older people will have far lower mortgages than a town of mainly younger people.

Here $300 000 won't even buy you a one bedder unit.

In the town in country NSW where we have our mortgage, even though our house is on the cheaper side, we have what locals class a huge mortgage at $350 ish because many of them are older, and retired and have no/hardly any mortgage.