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Do you know which brand is in there?
the 09's had Bosch I believe.
then in 2010, they came with DENSO.
after that--- I dont know.
But the 09 coils had issues.
The Densos have been reliable.
My 2010 has the Denso coils. I just turned 167,000 this morning- still running fine on the factory coils.

You can try to take a peek to see the brand on the top of coil
 

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With almost all electrical components, one must realize that life span can vary wildly. If you bought a 6 pack of light bulbs and installed all 6 in fixtures at the same time, one may fail tomorrow and one may still be working 10 years from now. I had a Jeep Grand Cherokee that I bought new and when I got rid of it with 190,000 miles, it still had all 8 original coils.
 

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Yeah, coils are something I’d never proactively replace. If say at 50k you replaced half of them and one failed at 90k I bet it’s just as likely one of the ones you replaced failed as it is one of the originals. Seems like just luck on how long they last.
 
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