What year, day, and month did Aharon (Aaron) die and how old was he?
Answer From The Annual Reading Schedule - Week 40 Notes For Numbers: The 40th year after the children of Yisra'el (Israel) had come out of the land of Mitsrayim (Egypt), on the 1st day of the 5th month – Aharon (Aaron) was 123 years old (Numbers 33:38-39).