Do not be concerned for these people. With a net worth of $4.5m, and some more at 49 yrs old, they are more than ready to retire. No need to deleverage. Loan interest rate is only 1%. They are probably collecting rent from their 2nd property. Looking at their income and expense, they are saving $300k pa. Within 3 yrs, they can comfortably pay off their loan of $750k. And I think they can actually pay off the loan now if they want.

Worry for yourself