Muslim tradition included this concept.
The date of His birth confirmed the truth of the saying attributed to the Imam Ali, the Commander of the Faithful: "I am two years younger than my Lord." [the Bab is two years younger than Baha'u'llah] The mystery of this utterance, however, remained unrevealed except to those who sought and recognised the truth of the new Revelation. It was He, the Bab, who, in His first, His most weighty and exalted Book, revealed this passage concerning Baha'u'llah: "O Thou Remnant of God! I have sacrificed Myself wholly for Thee; I have consented to be cursed for Thy sake; and have yearned for naught but martyrdom in the path of Thy love. Sufficient witness unto Me is God, the Exalted, the Protector, the Ancient of Days!" From: The Dawnbreakers, by Nabil, p.14
From Beharul Anwar Imam Ali (as) said, "I am two years younger than my Lord." (Ref: Beharul Anwar, volume 38, page 278. This tradition appears in the footnote)
Amazing Baha'u'llah also knew the footnotes of traditions.
I should stop answering you, do not know why I continue, maybe just to show thee is so much more you are yet to consider?
Regards Tony