Our house is only 7 years old, we bought it 2 years ago. But it still needs fixing, there are things the previous owners did that we're not happy about.

First though is the backyard - there isn't one, the house goes from veranda, through a huge paddock of weeds to the back fence. We do now have the dirt and loam spread and leveled for a real backyard
The carpet in the kids rooms and office needs replacing. It feels horrible to walk on and is stained. For some unknown reason there is a big square cut out of the carpet in the middle of DD's room, it was hidden by the bed when we came to look at the place.
Our room and DD's room needs the cornice and wall fixed where they've wall mounted tvs. When we looked at the house the tvs were unplugged, we didn't know and assumed all cords went through the wall where they were mounted. Turns out the cable comes down through the cornice, and the power cord has to be plugged in on the opposite side of the room, run across the floor and up the wall. Looks so stupid!
There are holes in the kitchen wall by the fridge where they'd put up an odd ugly ill-fitting spare cupboard. Our fridge and microwave wouldn't fit with it there so we took it down, not very neatly lol.

The main reason for not fixing things is money. Though I guess some of those things aren't that expensive, I guess we haven't cared quite enough just yet.