I bought used cars before but will never get one with more than 25K miles on it. Almost everytime I've been burned on cars with that much mileage. So now I buy brand new or just one 1 year old with less than 10K miles. Anything else and you're asking for some major issues if using as a day driver. I make sure to keep 2 vehicles for that same reason.
I bought my car with 22K miles. Really though with provable service records and an inspection you should be fine going above 25K. It's not like the old days where buying a used car was pandora's box and other than an eye test you had no idea how it was maintained. Hell I took my parent's 17 year old truck to get an oil chance at a random place and it was documented on Carfax.
Cars are a complex purchase though. Its a need people wrap their wants around then justify it to themselves. Needing something stable and reliable means they should buy new when in fact they could get a 1-3 year old car and have it be just as stable and reliable. Being able to afford it means being able to make the monthly payments when in fact if they had to go write a check for the full purchase price either they'd find a reason to justify not doing so or would be unable to do so, or if they had to buy it with money they had at the time they'd buy a less expensive car.
At this point cars are damn near a subscription service. They want you making monthly payments for life. They're marketed as being this entertaining product. People tie their identities to them. Once you start deriving entertainment value from a very expensive tool used to get you from point A to point B the trouble starts. Look at other things like homes, regular people don't live in a home for 3 years get bored with it then go out and buy a new home because doing so is far more prohibitive than swapping cars. Regular people don't only decide to buy new homes and seemingly have no problem buying used homes.
I'm far from rich but the moment I broke away from that car as entertainment mindset my finances drastically improved. I have the means to have a much nicer, newer, and more expensive car than I do but I choose not to.