How does ear size relate to aging?

Ear size is indeed related to aging. According to Andrew Huberman, ears grow throughout our entire life, increasing in size more rapidly as we age. This phenomenon is attributed to changes in collagen synthesis and other biological pathways. Interestingly, measurements of ear size can be used to calculate biological age. There's even a formula involving the circumference of your ears in millimeters, which, when processed through specific calculations, can estimate your biological age 1. This reflects broader physiological aging processes, including those related to collagen, which is also why other facial features like noses continue to grow.