If my area is any indication of seniors using trikes, you are way ahead of the seniors where I live. I'm not in an age-restricted, "seniors-only" neighborhood but do live near a very large senior apartment complex. I ride the trail that runs along side it several times a week and can't recall seeing anyone on an adult trike using the trail to get to the nearby Walmart store where many of them shop. I frequently see electric wheelchairs or people using walkers. I know there is a group of about a dozen retired guys who ride recumbent trikes. Far more than trikes like the Meridian.
It might be good "insurance" to have a legitimate bike shop check the spoke tension on your replacement wheel before it gets installed. Then you know it is right. It's cheaper than buying the next wheel and less of a hassle.

You also might spend a few bucks to buy a bike computer. You can get them for as little as $5 one ebay New Waterproof Digital LCD Bicycle Computer Bike Speedometer Odometer US | eBay and they are simple to install. Then you can keep track of your miles. I do and it reminds me when I am getting lazy and need to go our riding