His physical incarnation was not immortal in the sense that it was not subject to aging in physical appearance - it was explicitly stated that he was subject to this aging.
From "The Istari",
Unfinished Tales:
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...and Men perceived that they did not die, but remained the same (unless it were that they aged somewhat in looks)
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For with the consent of Eru they sent members of their own high order, but clad in bodies of as of Men, real and not feigned, but subject to the fears and pains and weariness of earth, able to hunger and thirst and be slain; though because of their noble spirits they did not die, and aged only by the cares and labours of many long years.
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From Appendix B,
Lord of the Rings:
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They came therefore in the shape of Men, though they were never young and aged only slowly, and they had many powers of mind and hand.
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Whether or not the hair change was an indication of this aging, I don't know, but his body did age.
[ September 26, 2002: Message edited by: Legalos ]