At What Age (On average) do Chicks lose their "peep" noise?

[LilChickCoop]

I think Piano is now 4.5 months old and has just lost her peeping noise. Does this sound consistent with what you experience?

 

[Whiskey Bay]

LOL....I have an 8+ month old Silver Wheaton roo that still coo's and peeps when he jumps in my arms and snuggles...

 

[BerrytangleFarm]

Our 12-week-old Reds and Australorps have traded in the "peep" for the "cluck" recently.