Car has 205,000 miles, starter will turn over but enginge won't start

Can you confirm your getting fuel? The fuel pump could be dead. Most any more are electric and in side the gas tank. Some you can hear humming when you first turn your car key on. Some also have a circuit safety breaker in the truck and a fuse. Any of which would cause it to not start. I don't know anything about Volvo but you might be able to discount the fuel line, hold your thumb over the end and have a friend quickly turn the key on and off. You should feel pressure on the line if the pump is working. Use lots of caution when dealing with gas. Its also possible the fuel filter is clogged. You also need to confirm your electrical system is providing spark to the plugs. Remove one plug and lay it against metal value cover. Turn the engine over for a sec and watch for spark. Just a very short sec hopefully should be enough to see a spark. If nothing then the problem is electrical.