Unsure of the age of this range/oven, but it looks older than 10 years. All burners stopped working this past week. Now when I turn on the dials, gas comes out and can be lit with a match, but not igniting on its own.

I took the top cover off and looking at the diagrams on this site have identified what I think are the "cone, top lighter", of which there are two, one on the left and on the right sets of burners. Not sure how it works because the range doesn't have an electrical plug. Is there something else I should be replacing? The tubes that run from the back of the oven dial seem intact. The back of the oven dial seems to feed gas into the oven, attach to a thermocouple, and also the connects to the entire ignition system and oven pilot system. Not sure how that works, maybe the pilot unit in the back under the oven is what the problem is.

Any advice is greatly appreciated. Thanks!