Hi,
That's really an impossible question , any part at any time can fail , be it a brand new car or a 10 year old car , parts fail. Now what you could start to notice is age related wear and tear . A car is only as good as its owner wants it to be with regards to condition and performance , some people don't even bother changing their oil
If you take care of her and she sails through her MOT tests then just enjoy her and don't worry , especially with the kind of mileage you are doing.