My 4/4 is 9 years old with 39000 miles on the clock. It has never failed to proceed but I am fastidious about maintenance and preventative work.
Potential failure points are mostly around plastic capped radiators - either choose a car that has been already changed to an aluminium radiator or budget for the change. I had mine changed at the first service post warranty expiry.
2014 or thereabouts 4/4 and +4 suffered from weak rear springs. Again, check that they have been changed or budget for an upgrade. In this case, my preference would be to budget for an upgrade - that way you get to choose the springs that are fitted. Cars without spare wheels are not that easy to change rear springs on as access is restricted.
Kings pins & bushes are wear items - my first set lasted 38000 miles but others report much lower mileages. Key improvement is a gaiter on the rebound spring to keep road grit away from the king pin & lower bush. When replacing, insist on hard chrome pins and ensure the reaming is done by someone who knows what they are doing.
Cars with limited use can suffer from rear brake cylinder leaks if brake fluid goes unchanged for extended periods. Not expensive to fix either at a dealer or DIY.
Phil at Allon White has written useful buyers guides -
https://allonwhite.co.uk/classic-morgan-car-buyers-guideAlso consider getting DaveW’s book - Buying and Maintaining a Modern Traditional Morgan Paperback by David Wellings.
