Final answer:
The age of Salam, the baby pre-human fossil, was not mentioned specifically. However, other fossils have been dated to different time periods.
Step-by-step explanation:
Salam, the baby pre-human fossil, does not have a specific age mentioned in the information provided. However, the information does mention the ages of various other fossils, such as Sahelanthropus tchadensis, which is nearly seven million years old, and Homo heidelbergensis, which is approximately 600,000 years old. It is important to note that the age of a fossil is determined through methods like radiometric dating and analysis of the fossil's characteristics.