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That's quite an old fish. What is the average age they live to?
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I bought four Silver Dollar fish when I graduated college. Two lived about 10 years, one about 15, and my last one is still going strong. He is currently in his third tank that is only a 10 gallon. I have had tetras, pictus cats, angel fish, and various algea eaters in the same tank but he has outlived then all. I only have a small algea eater in the tank with him now. There hasn't been a heater in the tank in at least 10 years.
I do very little other than feed him daily and clean the tank when needed. I vacuum the tank a few times a year and add water about once a month and change the water completely about once per year. My Dollar started in a 35 gallon hex tank but after it started leaking, he has been in two of the cheap 10 gal tanks in my spare bedroom. There has not been a heater in the tank in over 10 years so the water is probably 72 degrees in the summer and 68 degrees in the winter. I have never tested the water PH or hardness. I used a hot tub test strip tonight and the hardness looks to be over 1000 and the PH is below 6.8. I haven't had any plants in the tank in years. I use a Whisper Power Filter over the back of the tank and I give him a small pinch of Wardley Tropical Flakes every morning when I turn his light on.