When Luke (3:23) said He was "about thirty years of age." He began His ministry in 28 AD (Luke 3:1). Many suppose He was 30. Now He was born before the death of Herod, Matthew 2:15. And He was then a toddler, Matthew 2:11. His ministry being a minimum of 2 years, three Passovers, John 2:13, John 6:4 and John 11:54-55. Making the crucifixion in 30 AD.

Herod is dated to have died in 4 BC. Jesus would have to been born likely no latter that 5 BC. Making Him at least a 1 year old as a toddler. His ministry beginning in 28 AD would ;make Him to be at about 30 to be 32 years old. And then about 34 when crucified.