They can be easily fixed, and parts are still available - unlike my Mom's 5-8 year-old Samsung and LG appliances, which will have to be thrown away and replaced soon, because parts are NOT available. As for efficiency - they're not really much less efficient than new ones, especially when you figure that each of them has outlasted a half-dozen or more modern appliances.
When the washing machine tub cracked a couple of years ago, I asked the local parts shop if it was worth getting our old Kenmore(Whirlpool) machine fixed, and when he found out it was from 1987, the manager said, "Don't ever get rid of it! You can't buy anything made that well today at any price!" So I spent $80 on a new tub (plus $75 for labor, since installing it is a pain). That's one of only two major repairs it's ever needed (I swapped out the synchronous clock driven cycle controller myself 15 years ago) - it still runs just like it did when new.
It's certainly possible that all my appliances could outlive me...