Theory unprovable
Let's assume there is only one Adelaide, and that she ages like a normal human. (Down Syndrome does not slow one's aging.) She's clearly over 5 and under 10 years old in 1978. That would make her born between 1968 and 1973, which would make her 38 to 43 in 2011, the show's present. She looks 30-35. Constance said in Halloween, Part 1 that she'd been dealing with Adelaide for "30 some odd" years, not 40. Adelaide was very cagey with her response to Violet about her age in the same episode. How old is she really?

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