It depends, there are definitely some areas that are much older and of retirement age, Lake Havasu is the first one that comes to mind. I currently live in the Tucson/Southern Arizona area and while there are a lot of people of retirement age where I live it's also a fairly young area. However, the issue I've had here is that people marry/settle down very young, I'm talking around 21, and there isn't much outside of that. Many of the women that are single and available here have a ton serious issues (drugs, criminal behavior, etc.). There are also a ton of single moms, typically hot and slutty looking Mexican girls with more issues than you can count.Isn't AZ full of old people too, at least in the warm areas where the snowbirds go for the winter or move to retire? I guess Phoenix area where you're moving too would be a lot better though being a major city. I'd imagine most under 50 in AZ live there due to it being the only large city in AZ where most the jobs are.
Of course major cities will have more diverse and more younger people due to jobs and more industry and such. If you're in a top 45 metro area I don't see why OLD like match or Eharmony should be a problem to use. So many more choices, and more people working and using it due to time constraints and such. When you don't live in one and see the same suitable 35 or so women in a 60 mile radius on day after day after day with little new blood, that could be a problem. They probably have about 2,000 or more men in that same region bombarding them.
A former vendor I"m still friends with at his current job where he lives about 30 miles south of me has a college kid who just started working there because he's going to the local university. He's from Miami and thinks it's hell over here with the old people and lack of younger people and just boring he said.
There are just a lot of men and women here that are just really off so I just do my best to avoid them.
I was raised in a wealth off family so a lot of what I see and interact with here is completely alien to me, so naturally I have a hard time with dating here. Scottsdale is a more affluent area and just by living in the greater Phoenix area I'll have far greater access to a larger variety of women. Where I'm currently at I can go out on a Friday or Saturday night and see a lot of them same people there, which can be either good or bad depending upon where you are at in your life.