So here is how/why:
While most guys MrB's age were smoking, using drugs, drinking heavily and enjoying holidays to places like Thailand, he was saving for a deposit to buy a house. A perfect block of land in the perfect location popped up so he bought it. He was in his mid 20s.
While living with his parents, he was able to make extra repayments and therefore halve the term of his loan.
Of course, none of this would have been possible without his lovely parents who brought him up the way they did, which I am extremely thankful for.