Many people say and believe it is normal....Maybe it is for the cars they drive...I've NEVER seen it in any vehicle I've owned (except my Vega). Daughter is still driving my old 98 Pathfinder with over 340k miles....Uses less then 1/2 pint every 5k miles....So 1 quart every 1k miles seems awfully excessive to me.
Just keep driving and checking the oil. Depending on where you live , you might go to a slightly heavier grade of oil. For instance, it you live in Florida, a 15W40 would be a good choice. Just don't visit you aunt in Minnesota in January with this oil in the crankcase.
To start tinkering with a Volvo at that age and mileage will cost you a fortune.
I don't know anything about a volvo, so this might sound stupid. But does this car have a PCV? Possitive Crankcase ventilation valve? Now if so take it out and shake it. If it rattles then it is good. But for the cost I would replace it. This does cause oil usage. Hope this helps. I didn't see anyone else suggesting it.