The aging process leads to a gradual reduction in pulp chamber size due to the continuous deposition of secondary and tertiary dentin. This results in a decreased pulp volume and altered shape, impacting the tissue's vitality and reparative capacity. Additionally, cellularity and vascularity decline, but the primary clinical significance is the decreased pulp size, which affects endodontic access and treatment outcomes. Understanding this helps in planning conservative surgical approaches to avoid excessive tooth weakening.

Reference: Oral Histology, B.K. Shanson, 8th Edition.