This Is a Certified Answer

Certified answers contain reliable, trustworthy information vouched for by a hand-picked team of experts. Brainly has millions of high quality answers, all of them carefully moderated by our most trusted community members, but certified answers are the finest of the finest.
Onomatopoeia of the seven ages of man are following:

whistles in his sound
big manly voice
and others  

onomatopoeia is a sound in a sentence.