The idea that “older chenpi is better” mainly comes from changes in flavor and mouthfeel. Chenpi is citrus peel that has been aged rather than used fresh.
Flavor Changes with Aging
As chenpi ages, the aroma becomes more restrained and bitterness and sharpness soften, resulting in a rounder, smoother taste. The aged aroma becomes more noticeable and suits brewing and cooking.
Differences by Age
Lower-aged chenpi tends to have more direct citrus notes and stronger bitterness, while higher-aged chenpi is steadier and softer. Different ages fit different preferences and use cases.
Overall, “older is better” is largely about flavor experience, and choice should still match personal taste and intended use.