behave in a manner appropriate to your age
вести себя соответственно своему возрасту (vesti sebya sootvetstvenno svoemu vozrastu)
"Stop being so childish and act your age!"
"Перестань быть таким ребяческим и веди себя по возрасту!" (perestan byt takim rebyacheskim i vedi sebya po vozrastu)
to make maximum effort even when it’s tough
to relax and do nothing
to make a sincere promise
to reach the lowest point of failure or depression
to successfully finalize an agreement
to leave for a particular place
