I consider 100,000 miles to be the sweet spot for buying used cars. At 50K miles it is hard to tell how a car has been treated; at 100k miles it is hard to hide. I can more reliably get another 150K miles out of a 100k mile car than a 50k mile car.
However, that is a mighty high price. $8000, if it is in good condition, is more like it.
Ignore Carfax - I have never seen an accurate Carfax report. They are especially bad in the miles and owner records, but they are still bad in accident reports. If you get serious about a car, spend the $100 or so for your own mechanic to do a pre-purchase inspection. He will tell you what is right and wrong with the car, something Carfax could never do. Pre-purchase inspections can, and often do, save you thousands.
Otherwise, the 2014 Civic was a good year. There was a transmission software recall that should have been done but in the course of racking up 20K miles a year I bet it has not yet been done.
Just get that price down or walk away. Remember, the dealership will try to tack on all sorts of extra charges.