If the convo betweeen Ereba and Char on Tuchanka is selected more than one, Char iis able to convince Ereba to stay on Tuchanka, although she is clearly not happy about it. However, in ME3, Ereba is working on the Citadel and Char dies in combat on Utuku... so their "flower" (i.e. child) will be raised by Ereba. In ME3, we also hear a human parent arranging to send her daughter to her Asari partner's family to be looked after while she is fighting Reapers.
These are the only two indications that I am aware of as to how the raising of children who are born from Asari and non-Asari parents. As indicated, they will always appear to be fully Asari anyways. It is Ereba who tells Shepard that in ME2 when discussing her relationship with Char on Ilium.
In ME1, Liara does state that she is "only 106" and she also indicates that she is "considered little more than a child." Samara's daughter ran off at 40 and Samara says that is young to be on her own... As a result, I think that the presented "age of maturity" of Asari actually changed between ME1 and ME2.
Overall, I believe that Bioware's timelines/lifespans, etc. for the Trilogy are perfectly consistent throughout the 3 games.