According to Luke, about how old was Jesus when he began his public ministry?

According to Luke, Jesus was about thirty years old when he began his public ministry.

Luke 3:23 gives the age as “about thirty years” when Jesus began his work, shortly after describing his baptism by John. The wording is approximate rather than an exact birth-date calculation. The verse introduces Jesus’ genealogy and marks the transition from his earlier life in Nazareth to preaching, teaching, healing, and gathering disciples.

The Gospel of John records several visits to Jerusalem and mentions Passovers, so readers have sometimes tried to estimate the length of Jesus’ ministry from that chronology. However, the Gospels do not provide a complete modern-style timeline or an exact date of birth. “About thirty” is therefore the precise answer to Luke’s statement, not a claim that every historical reconstruction yields the same age. This detail is also frequently compared with Jewish and biblical traditions in which thirty can mark maturity or entry into a significant public role.