Final answer:
Kenyanthropus lived approximately 3.5 million years ago during the late Miocene period.
Step-by-step explanation:
The age of Kenyanthropus is approximately 3.5 Ma, which stands for 3.5 million years ago. Kenyanthropus is a genus of hominid that lived during the late Miocene period, 10 to 5 million years ago. While the fossil evidence from this time period is limited, the age of Kenyanthropus is based on scientific dating methods and analysis.