The London ... 8 (Bloomberg) -- The cost of borrowing in dollars overnight in London soared for a third day before central banks around the world lowered interest rates in a joint effort to restore confidence to the global financial system. Oct. There is no upper age limit set by HUD for the borrower. Nor is there a certain income level that the borrower must achieve in order to buy a home at a certain price. And although income is certainly an important factor, it is simply one of the several determining factors which are used by the HUD to find whether the borrower will be able to repay the mortgage.