Hey, Telken.
I got my Pionus, Pascal, when he was already 6 years old, from craigslist. Pascal is completely bonded to my husband and I, and is very well behaved, in virtually every manner. (Except for breeding season, then he gets.. uhh... "moody" LOL)
I think you'd be fine getting these two from craigslist, they appear to be in good feather, from what I can see the beak/nails don't seem to be overgrown either. They're both banded, too, so maybe you can use the numbers/letters to find out what breeder they came from, if you're REALLY curious about their past.
Are they living in the same cage? The pictures make it look like they're both in/on the same cage, so I'd be concerned about them being bonded to each other, and not caring to bond to another human. It isn't impossible by any means to have a pair of birds living together, and be completely people-friendly; just might take more time and effort. The two-year-old will probably have a hormonal period in a couple of years, so be prepared for mood swings. The 10 year old should be mellowed out by now and be less spontaneous during those times. (Keep in mind I'm speaking generally.. every bird is different!)
Glad you're doing your research and being cautious when it comes to these decisions, and thank you for giving an "adult" bird a chance! They can be so so so rewarding. I love my Pionus to bits.
EDIT: I saw your other thread, you started talking about bar spacing for a pionus' cage. My white capped pi (smallest of the pionus

) has a roomy cage with one-inch bar spacing and its perfectly fine. Figured I'd add it into here, instead of posting on both.
