Would the Zoo ever consider having an "adults only" session where older, more fragile people could enjoy the zoo without the commotion of families.

probably not no underage lose to much money businesses care about money nothing else(profits) but should have a set weekend for elders only

Thats a question for Zoo Administrators. Good idea too!

During the week when school is in session is a good time for them to go. There's also the wind walks things where it's geared more towards adults