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As said, something maybe downstream of the coolant leak or something structural. The Panda died due to suspension mounts. Availability of parts and cost vs value meant I scrapped it for £300. Granted the C Max holds a little more value than the Panda, but it potentially wouldn't take much to make it uneconomical to repair. Eg. if something cost £1.5k to fix, that's half the value of the car, which you would think would be worth doing, but it's not going to add £1.5k in value and something else could equally go bang once I fix the £1.5k problem.
What do you think will "pop"? AFAICT what kills old cars is getting a garage bill for "more than it's worth" for something routine (brakes, tyres, suspension bits, etc) rather than the car breaking.
If you're happy with the car, there's no particular reason you can't run it forever if by throwing occasional money at it. You'll still come out ahead over the silly money you could spend on financing another one.