To diminish or impair in quality, character, or value
Moisture content is the critical factor that makes wood susceptible to decay. It must exceed 28%, and liquid water must be present in cell cavities before decay fungi can gain a toehold. Once...
decline, worsen, degenerate, slump, go downhill
Yes. All soft body parts do. Eventually, only the skeleton remains.
every person is different but usually not until past the age of 60