This is the 1178th most frequent Russian word.
возраста
"Возрастa" in English means "of age" or "age's" (possessive form of "age").
Here "возраста" is in the instrumental case "с возрастом" indicating the means or accompanying circumstance by which something happens—in this case, wisdom associated with aging.
С возрастом люди становятся мудрее.
With age, people become wiser.
Here "возраста" is in the nominative context "Возраст" referring to the concept or measurement of age directly in a general statement.
Возраст человека играет важную роль в его жизни.
A person's age plays an important role in their life.
Here "возраста" represents part of "возрастными категориями," modifying "категориями" to specify that the restrictions or classifications are based on age.