Older Rhinos often complain that their veggies don’t taste like back when. They’re saltier, spicier, or duller, or… well, different. There are explanations of this phenomenon, not all of them associated with Rhinos aging.
The most noteworthy fact is that the Earth itself is changing all the time. Soil is not a passive participant in a plant’s development. Like everything else, the soil is in process, and that affects the plants that grow in it.
Also, the plants themselves are responding to Natural forces, developing in ways that suit them, without consideration of Rhino preferences. “Sort of inconvenient,” We Rhinos mutter.