年龄

age

♦ 他参军还不够~。 He is too young to join the army.

♦ 从马的牙齿可以看出它的~。 You can tell a horse's age from its teeth.

♦ ~不饶人。 Age will show itself. or Age will tell.

~结构 age structure~群 age set~性别组成 age-sex structure