Suggestions for more detailed onset terms

Prof. Dr. Peter Robinson

Dear HPO community,
we have received a request to add subterms for "young adult onset". Different communities tend to use different cutoffs, and so I was wondering if there are any comments or suggestions about the ones proposed in this issue (which look quite reasonable to me):
Also, we are planning to similarly add more granularity for prenatal onset terms and are looking for feedback.
thanks !