Buying 2014 with 80-90k miles

Am I being unnecessarily cautious / skeptical about buying an older car?

I am coming to the end of a PCP (Vauxhall Cross X - 49k miles) and setting sights on getting a Mazda 6 Sport 2014 model, and the Mazda cost comes in less than the refinance amount of the Vauxhall.

The two cars I am looking at are currently at 80k and 90k miles, but very good service & MOT history, and both have a fresh service and MOT when sold.

I am finding myself doubting whether getting a car of this age/milage is wise. What do you think?

Edit: Mazdas are both petrol