Act one's age: to be mature and not childish.
D
og's age/ coon's age: refers to a long period of time.
Feel your age: to realize that your growing old.
Golden age: period of prosperity.
Long in the tooth: to be very old.
Over the hill: no longer be able to do something at an acceptable level because of age.
Put years one : to make someone look or feel much older.
Young at heart: to have a youthful spirit inspite of old age.
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200 PLUS IDIOMS
Non-FictionYou want to spice up your writing, this idioms are for you😉.