[Galin]

There are two 'notes of note' here, written on the same paper (different sides) and possibly as late as 1972.

Tolkien mused about having the 'other two' wizards arrive in the Second Age -- though even this is not a given or his last word on the subject necessarily, because on the back of this (if I recall correctly) I would suggest that Tolkien implies that all five wizards came at the same time rather, generally speaking.

Did JRRT mean all five came in the Second Age? Possibly I guess, but that would become arguably problematic concerning Appendix B for example, not only with respect to wondering why they aren't mentioned in any entries, but where it's stated that the Istari appeared in the Third Age.

I assume(d) the late note implying that they all came at the same general time rather 'rejects' the idea of having the other two show up very much earlier ('rejects' it, if later of course), rather than placing all five wizards in the Second Age -- as if the Third Age is meant, that would agree with what Tolkien had already published concerning the Istari.