act one's age

Behave more maturely. Although the phrase often is used in asking children to act in a more grown-up fashion ( Only babies suck their thumbs; act your age), it also may refer to an adult who is, sometimes deliberately, acting much younger than might be considered appropriate ( Grandpa, it's time you stopped climbing ladders and acted your age).

Common Names:

Name	Pronounced	Usage
Lexie	LEKS-ee	English
Liddy	LID-ee	English
Morven	MAWR-ven	Scottish
Lamis	-	Arabic
Blaga	-	Bulgarian
Alexandra	al-əg-ZAN-drə (English), ah-lek-SAHN-drah (German, Romanian, Spanish, Italian), ah-lək-SAHN-drah (Dutch), ə-lə-SHAN-drə (Portuguese), ə-lə-SHAN-drə (Brazilian Portuguese)	English, German, Dutch, French, Swedish, Norwegian, Danish, Icelandic, Greek, Portuguese, Romanian,