The Life of Mahalalel

• Mahalalel (son of Kenan)

• Start — Genesis 5:12. The year of Mahalalel (son of Kenan)'s birth is the year his father, Kenan, was born (326) + the age of his father at Mahalalel (son of Kenan)'s birth (70) = 396
• End — Genesis 5:17. The year of Mahalalel (son of Kenan)'s death is his birth year (396) + his age at death (895) = 1291

Years are anno hominis — counted from Creation as year 1 — which is the frame the source computes in. The arithmetic behind each boundary is given above rather than assumed.