All of the following are characteristics of a building material EXCEPT:

When discussing the characteristics of building materials, durability, color, and weight are all critical factors that directly affect the performance, aesthetics, and usability of materials in construction.

Durability refers to a material's ability to withstand wear, pressure, and environmental conditions over time. A durable material contributes to the longevity and maintenance requirements of a structure.

Color can influence the thermal performance and visual appeal of a building. It can affect heat absorption, reflecting sunlight, and even the overall aesthetic of the structure.

Weight is also a fundamental characteristic because it affects structural design, foundation requirements, and handling during construction. Heavier materials may necessitate stronger supports and can influence transportation logistics.

In contrast, the age of a material does not inherently define its characteristics for use in construction. Instead, age might indicate prior exposure or degradation, rather than a specific property of the material itself. It is possible for an old material to be highly durable or still in good condition, thus not fitting as a defining characteristic when evaluating materials for building purposes.