According to historians and biblical scholars, The Lord Jesus was between 13 months and 2 years old when the wise men or magi came to see Him.
This is largely based on Herod's wicked decree that all male children 2 years and younger should be put to death.
Herod based this on the Magi's findings and when the king star appeared in the sky.
Discover More Secrets From The Bible (Click Here)
Matthew 2:16-18
16 Then Herod, when he saw that he was mocked of the wise men, was exceeding wroth, and sent forth, and slew all the children that were in Bethlehem, and in all the coasts thereof, from two years old and under, according to the time which he had diligently inquired of the wise men.
17 Then was fulfilled that which was spoken by Jeremiah the prophet, saying,
18 In Rama was there a voice heard, lamentation, and weeping, and great mourning, Rachel weeping for her children, and would not be comforted, because they are not.