32 AD. The Gospels do not speak about the exact age of Jesus at the beginning of His ministry, we know that He was about 30 years old. Jesus was not a descendant of Aaron, so he had no reason to start ministry at exactly thirty years of age. According to the Gospel of John, during his ministry Jesus was in Jerusalem three times during Passover. I assume that His ministry began in 30 AD. This may explain the reason why the Lord God rejected the Yom Kippur sacrifice 40 times before the destruction of the Temple in 70 AD.