Board Thread:General Discussion/@comment-24942479-20170426102234/@comment-4260948-20170426144024

Maleficent is about 90/100, at least. Kristin Baeur Van Straten is 43 (approx. 41 at the time of filming for Season Four of Once Upon A Time), so assuming the actresses age is how old Maleficent is meant to be in our world acting as a "normal" person and not a fairy tale character, which most people don't know exist, then that puts Maleficent at the age of at least ninety three.

Fifty years (half a decade that the tree burned on fire) plus Kristin's age, with a few years to adjust for Cora's age of approx 60, as Cora has a spell book that Maleficent once used, which makes Maleficent about 100 approx.

Of course, as she has magic she could be fifty bajillion years old for all we know, but working from the timeline that we currently know, she's about 100, give or take a few years...