The three ages of the three age system as developed by C J Thomsen are The Stone Age, The Bronze Age and The Iron Age.

No, the Ice Age is not a part of the three age system as the three age system adheres to man-made developments in the world. The Ice Age was an environmental development.

The three-age system is the periodization of human prehistory into three consecutive time periods, named for their respective predominant tool-making technologies:

The Stone Age
The Bronze Age
The Iron Age
The system is most apt in describing the progression of European and Mediterranean societies, although it has been used to describe other histories as well. The system has been criticized for being too technologically determinist.
Aluminium is the most abundant metal in the Earth's crust, and the third most abundant element therein, after oxygen and silicon.

it is just like saying "but no copper age", "no gold age" if you search the wikipedia "three-age system" you will notice this type of arguments from different part of the world. Remember also the "ice age".

Caesarion was three years of age when Julius Caesar died.

Caesarion was three years of age when Julius Caesar died.

Caesarion was three years of age when Julius Caesar died.

Caesarion was three years of age when Julius Caesar died.

Caesarion was three years of age when Julius Caesar died.

Caesarion was three years of age when Julius Caesar died.

Caesarion was three years of age when Julius Caesar died.

Caesarion was three years of age when Julius Caesar died.

Caesarion was three years of age when Julius Caesar died.

The Stone Age is characterized by the use of stone tools by early humans for hunting and gathering. It is divided into three periods: Paleolithic, Mesolithic, and Neolithic. During this time, humans developed language, art, and culture.