Final answer:
Judging a spirit's maturity by its smell involves assessing its character, which includes the complexity and nuances of its aroma, indicative of its distillation and aging processes.
Step-by-step explanation:
When indicating that a spirit is mature on the basis of its smell, you are judging the character of the spirit.
The character of a spirit encompasses a range of olfactory attributes, including the complexity and nuances of its aroma.
This is reflective of the quality and maturity of the spirit, and is a testament to the distillation and aging processes it has undergone.
The intricate balance of scents within a mature spirit often suggests a profound depth that can be appreciated by both the connoisseur and the casual drinker alike.