Well, if you want to get technical, the basics are:
Clean water
U.V. Light
Completely dry basking area
Heat lamp
Live food
Sunlight once or twice a week if you have all that, that is not through glass or Perspex.
Some sort of calcium boost. You won’t get enough from the food.
Aquatic plants to munch on at breakfast.
The basics you are talking about are complicated for most people. Turtles are not an easy animal to care for. People seem to assume they are easy because they don’t die from the lack of care. Sure, they are very hardy and hard to kill, but that doesn’t mean your turtle is getting the basics. If you say UV light and a dry dock, then you have completely missed the most important one of all. The heat lamp. It helps kill bad bacteria, fungus, infection, the list goes on. If I travel with my turtles for a weekend, I don’t take the UV lamp. I take the heat lamp. They can miss out on a few meals worth of calcium, but the heat lamp is a must. Absolute must.
Yes. We have all had turtles for decades. My Kreffts is probably older than you are.