Which of the following factors is not related to the contamination of sterile products?

The factor that does not relate to the contamination of sterile products is patient age. Contamination typically involves microbial presence or other impurities that can compromise the sterility and safety of a product, which directly affects the physical attributes, potency, and the chemical properties like pH of the sterile products.

Physical appearance can indicate contamination, as changes in color, clarity, or particulates may suggest microbial growth or other forms of degradation. Therapeutic potency is crucial since any contamination could alter the effectiveness of a medication, leading to inadequate therapeutic outcomes. pH is also important because improper pH levels can facilitate the growth of microorganisms or instability of the product, affecting its sterility and safety.

Patient age doesn't directly impact the contamination of sterile products. While it may influence the dosing or the selection of certain medications, it does not have a role in the physical or microbial sterility characteristics of how sterile products are compounded or maintained.