I just bought a BOB Revolution double jogging stroller last week off CL. It is about 3 years old and was lightly used. That thing retails for over $400 and I got it for $150. That's a steal!
I had a Baby Trend single jogger and used it almost daily with DS. So I know the purchase of a double makes sense. If it's something you're actually using for jogging, then it's a good option. Though personally, I would not get one that was 6-7 years old for $150, but that is only because I've seen better options on CL in my area.
If I were you I would look up reviews on the specific stroller you're looking at to see if people were happy with the construction of it over time.