Relier Pairs IDIOMS. AGEVersion en ligne IDIOMS. AGE par María Marteles 1 to act your age 2 get on in years 3 long in the tooth 4 feel your age 5 silver surfer 6 rob the cradle 7 (live to a) ripe old age 8 to be knee-high to a grasshopper 9 (be) over the hill 10 mutton dressed as a lamb To live until you are very old. Realize that you are no longer young Too old to do something An elderly person who uses the internet Very young or small child no to behave as someone younger a person who tries to look younger by wearing clothes designed for younger people Reach an age when you can no longer perform as well as before. Someone who is growing old. Have a romantic relationship with someone who is much younger than yourself.