Mouse-40 years old

We are using the desktop or laptop everyday, do you ever think of using the pc without mouse would be convenient. Some can use the keyboard for all purpose they wont be feeling discomfort without mouse.
Do you know how Old the mouse is?
It is 40 years old, it has celebrated 40th birthday on December 8Th, i.e.,
It is going to get into 41 age..
In 1968 Douglas Engelbart has invented the mouse, Around 1000 persons who joined together for a Technical seminar has viewed the mouse first time.
It has been called has pointing Device on those days, it is made up of wood with two wheels attached to it on bottom, and it is used to highlight a text on the computer and it was the only purpose it has been used at that time.