To respond to your question about "does a time come in the life" – yes, it does, and it is when YOU JUST CAN"T TAKE IT ANY MORE. Until then, try to hang onto that Malibu, it's got a good V8 and it should last you another 60,000 without needing many major repairs.
But then, I don't know the situation outside the US, I imagine there are things you have to take into account that I can't even guess at.
Best of luck! – Larry C. in the Motor City.