How many years have today’s modern helicopters been around?  

Congratulations. You are correct. Helicopters have only been around 100 years or to be more exact, 70 years. Please keep reading.

Copyrighted image of helicopter from "Microsoft Office Online" <http://office.microsoft.com/clipart/default.aspx?lc=en-us&cag=1> (October-March, 2004-2005). Clip art available only to licensed users for non-commercial purposes.