The answer is: 120

Deut 34:7

Moses’s life journey is as remarkable as the mountains he climbed. At 120 years old, his death symbolizes the culmination of a mighty legacy rather than a tragic end. It’s fascinating to note that his life can be segmented into three distinct 40-year periods: the first as a prince of Egypt, the second as a shepherd in Midian, and the final phase as the leader navigating the Israelites through the wilderness.

What many might not realize is that ancient world cultures often approbated aging and wisdom; a person of Moses's years was not simply considered old but affluent in experiences and divine guidance. Deut 34:7 captures this complexity where it mentions that "his eye was not dim, nor his natural vigor diminished." This seems to reflect a notion that Moses, even at an advanced age, might have still been at the peak of his spiritual and physical presence. Such is a grand testament to the forces driving leadership and faith; it offers strength even in advanced years.

Coincidentally, 120 is a number of significance across various cultures and texts. It's viewed symbolically as a representation of completeness and a divine appointment. From the angelic descendants in the Book of Enoch to the teachings of longevity, this figure connects back to divine milestones in biblical narratives. His story isn't just confined to numbers; it's a rich tapestry interwoven with spiritual trials, encounters with the divine at the burning bush, and the dramatic exodus that remain cornerstones of the Israelite identity.