Standard term for a person's or living thing's age; used in formal and everyday contexts.
年齢を教えてください。
Please tell me your age.
He looks young for his age.
I feel my strength declining as I get older.
Anyone can join this event, regardless of age.
It's best to adjust the amount of exercise according to your age.
He lied about his age when registering on the site.
年齢 is a person's specific, exact age, whereas 年代 usually refers to a range or group of ages.
actual age; true age
age group; age range; age bracket