Scholars have long supposed that Jesus was approximately 33 years old when he was crucified. There are no specific verses that tell Jesus’ age when he died. There are verses that tell how old he was when he accomplished certain things, as well as the cultural expectations of his faith community regarding milestones in a person’s life. The ones to look out for that relate to his death are when he started his ministry and how long he was in ministry for up until he died. Prior to that, we need to know when he was born. That has been estimated at the years four to zero BC. Luke 3:23 shows that Jesus was about thirty when he started ministry (26-30 AD) and was in ministry for three years – placing Jesus’ death at 29-33 AD. Other important milestones in Jesus’ life would have been circumcision, Temple redemption, Bar-Mitzvah, and reaching majority age (20 years old).

Source: Bible study tools