"Likely" is an "it depends" answer for each dragon (in this case, depends foremost on how the dragon is treated by kin/and friends (if any), then by other dragons, then by other creatures, in their unfolding life as a dragon. It tends to be rare rather than common.
#realmslore
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Xyn Raven
@XynRaven
Replying to @TheEdVerse
To that end, how likely is it that a grown dragon would change alignment?