How can the age of peanuts affect their grade?

The age of peanuts plays a significant role in determining their grade primarily because older peanuts are more likely to exhibit signs of rancidity and overall quality degradation. As peanuts age, the oils within them can break down and oxidize, leading to off-flavors and odors, which directly affect their quality and marketability. Additionally, older peanuts may experience physical changes such as loss of moisture, increased susceptibility to pests and mold, and changes in texture, further diminishing their grade.

In the context of peanut grading, these factors are critical as they influence both the quality assessment and the pricing of peanuts in the market. Quality standards for peanuts are based on several characteristics, including flavor, color, and texture, all of which can be adversely impacted by the age of the peanuts. Therefore, the statement regarding older peanuts showing signs of rancidity and degradation accurately reflects how age can influence their grade.