Of course 4200 square feet is too much space for 2 old people. As someone said, 1700 square feet is enough for a family of 4, never mind a couple of old coots, sitting around drinking mint jullips and watching TV. They will get lost in a 4200 square foot house. They'll need a GPS to make their way from the second den to the great room. Then there are the maintainence costs, which will be 3x the amount. Heating, cooling, paint, roof, taxes etc etc etc. As you add on to the house, all your major living expenses go through the roof. Triple the taxes, triple the utilities, triple the maintainance, triple the headaches. This is a very american thing to do; Buy way more than you need, and then get strung out on expenses that never go away. And then complain bitterly about how you are barely keeping afloat. How about this: Buy much less than you can afford, save the extra money from all the recurrent expenses, and build a buffer for when hard times hit (like when Apple's server farm blows up from overheating and levels your new house). But I'm tired of watching people make stupid financial decisions, living on the bleeding edge of what they can afford, and then when things don't exactly work out, they just don't understand why. So I say, just hold back a bit: buy a used car, even if you can afford a new car, buy a 2000 square foot house, even if you can afford a 4000 square foot house. Then you won't be on the bleeding edge of disaster, and if disaster does hit, you will have a nice cushion to save you.