No idea when previous owner looked at them. Let's say 28 years is possible. After the line to the fuel filter split lengthwise, dumped three gallons of gas under the car, in the garage, while I sat there reving it wondering why it kept dying, I'm a fuel line warning person.
Taking the fuel rail apart, somebody replaced four of the stubbies to the injectors, leaving two that were so hard and rotten they broke off the barbed fittings. The O rings were in the same mortified shape, to the point I strongly advise all who don't know their fuel delivery system personally to inspect it very soon.
Any reason why some injectors have four tiny bars ( 12/3/6/9 ) while others have none in the intake nylon insert ?