The average car in the UK is scrapped at 14-years. This is usually when the cost of the repairs start to outweigh the value of the vehicle.

I think your Micra has done a brilliant job carrying on for as long as it has. As long as the engine is serviced annually with an oil and filter change then there is no reason why it can't carry on for many more years.

Eventually, corrosion of the bodywork and suspension will become an expensive issue if the car is stored outside and used as a daily runner. But it reads like your Micra is being very well cared for and hopefully it'll be good for another 87,000.