I think you'd better regard a ROUTE as an one-way pipe.
Consider your example : ROUTE HIS.age to HER.age
As you know, when a new value is assigned to HIS.age, it is transferred to
HER.age. Thus, HER.age reacts to HIS.age.
However, HIS.age does not react to HER.age.
I think you may think of the ROUTE as HER.age = HIS.age.
The assignment occurs only when a value(possibly the current HIS.age's value)
is assigned to HIS.age.
Thanks.
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