Legal MCT is calculated with able-bodied adults in mind. A frequent flyer should know that a 1 hour connection in any airport represents a certain risk of missing your connection. How acceptable that risk is depends on many factors..but one would think that being accompanied by your 70+ year old mother kinda shifts priorities a bit. On that front, the responsibility rests on OP's shoulders. Of course that doesn't mean AA service isn't often decidedly sub-par.