I'm in my 70's and retired. My dad and brothers built me a pond at least 20 years ago, and it's one of the best things about my home. If it weren't for mosquitoes and wasps (hate them), I'd be out there a lot more. I take care of it myself and have some waders that I use when I clean the filters. It has a small waterfall and a small fountain. There are about 25 goldfish in it. One of my fish is blind, so I feed him food that sinks and make sure he gets some of it. Until I added some safe areas for the babies to go, I had no new fish. Well, I probably had them, but they were eaten. Now, they have a place to get away from the predators and some manage to live. This is an old photo of my pond when it was doing quite well.