By this fall she'll be:
a year older than when Dorothy Loudon took on the role in the pre-Broadway Goodspeed tryout (summer of 1976 when Loudon was still 50),
2 years older than when Carol Burnett played her in the first movie,
1 year older than when Kathy Bates filmed the TV movie,
13 years older than when Cameron Diaz did the remake,
2 years older than when Nell Carter did the 1st Broadway revival,
and 11 years older than when Katie Finneran did the revival.
Making her, by my estimation, the oldest major Miss Hannigan to ever originate the role.