The first thing that I usually like to tell people is location is the most important. Whether you just moved to San Diego or you are living in downtown or in North County, it's important to find a doctor that's close to you. Whether it's close to your home or close to your work, it should be someone you have easy access to. You don't want to drive 45 minutes to have to see your primary care doctor, not when you're sick.
Another thing is some patients have a preference between female and male providers. Some patients have no preference and that's totally fine. The doctor's schedule is also important. You want to know: Does your doctor work five days a week? Are they 7 am to 5 pm, or do they do late hours, which Scripps is offering now? We have extended office hours pretty much from 7 am to 7 pm and different providers take different slots of those times. So, it's something to look into. If you work from 8 am to 5 pm you want to be able to see a provider who is going to see you from 5 pm to 7 pm when you are off work.
If you don't speak English as your primary language or at all, it's important to have a doctor who can speak your language if possible. That just makes for a stronger relationship in general. To have a patient be able to communicate their concerns to their doctor without the need of a translator, makes it a much stronger relationship.
As for age, it really depends. Some patients have no preference. Other patients they don't really want to deal with the age gap, the cultural barriers and generational barriers, so to speak. For some folks, that's important. For some folks, it doesn't matter.