According to evangelical Christians, the most likely author of Psalm 90:12 is Moses. The Bible identifies Moses as the author of the first five books of the Old Testament, known as the Pentateuch or the Torah, and he is traditionally credited with writing Psalm 90 as well.

Moses is a central figure in the Old Testament, known for leading the Israelites out of slavery in Egypt and receiving the Ten Commandments from God on Mount Sinai. He is also revered for his close relationship with God and his role as a prophet, leader, and lawgiver for the people of Israel.

In Psalm 90, Moses reflects on the eternal nature of God and His sovereignty over all of creation. The psalm also speaks to the brevity and frailty of human life, and the importance of living with wisdom and a heart of understanding.

From an evangelical Christian perspective, the authorship of Psalm 90 by Moses adds to the significance and authority of the psalm, as it is seen as a reflection of divine inspiration and truth. As a result, evangelical Christians often turn to Psalm 90 as a source of wisdom, comfort, and guidance in their faith journey.