How well does the engine of the Cadillac SRX 3.6L V6 hold up, the one I am looking at has 121,641 miles and is a 2008....
It all depends on how the car was driven and maintained. I would worry more about the rest of the car than the engine. All those gizmos and electronic systems start going bad after a few years and they cost a lot to fix.
The motor you have, the 3.6L V6 is quite reliable. If it was regularly maintained, and you continue that, you should have no trouble getting another 100,000 miles from the vehicle. The 2008 didn't have too many electronic options to affect the reliability.
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