Jane Harrison did the Triple Goddess as phases of a (cis) woman's life before Graves did, and he drew on her, though I think she didn't use the word Crone. But MMC is definitely an entirely modern invention.
Hekate, however, comes closer than any pre-Christian goddess I know of to the idea. She was called a maiden before almost any other goddess in the Greek pantheon, barring Persephone, and remained a maiden goddess until the late Roman Empire period, when some plays depicted her as a crone. But, since "maiden" meant "unmarried", it was not inconsistent that she was also said to have children, including Scylla, Circe, Medeia, and Apsyrtus (Medeia's brother). However, all triple statuary of her consistently depicts her three faces as of the same age, and young.
Hecate is an exception to the pattern you mention, of being the same deity with three roles, or three deities with different aspects of the same role, and is instead one deity with three bodies, so that she can face in the three directions of the trivia, the three-ways (since "crossroads" in English usually means four ways, I like to be precise here).
You've heard me go off about this before, of course. I'm adding it to the thread for completeness of information, rather than informing you personally.
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Hekate, however, comes closer than any pre-Christian goddess I know of to the idea. She was called a maiden before almost any other goddess in the Greek pantheon, barring Persephone, and remained a maiden goddess until the late Roman Empire period, when some plays depicted her as a crone. But, since "maiden" meant "unmarried", it was not inconsistent that she was also said to have children, including Scylla, Circe, Medeia, and Apsyrtus (Medeia's brother). However, all triple statuary of her consistently depicts her three faces as of the same age, and young.
Hecate is an exception to the pattern you mention, of being the same deity with three roles, or three deities with different aspects of the same role, and is instead one deity with three bodies, so that she can face in the three directions of the trivia, the three-ways (since "crossroads" in English usually means four ways, I like to be precise here).
You've heard me go off about this before, of course. I'm adding it to the thread for completeness of information, rather than informing you personally.