Reference for Niddah 30:10

אטו ודאי ראתה מי אמר רבי יוחנן

only of a case where it is doubtful whether or not the woman did observe a discharge and where, [so that] even if some reason could be found for assuming that she did observe one, it may also be assumed that she had since performed immersions,<span class="x" onmousemove="('comment',' And since R. Johanan's ruling is based on the existence of these doubts there can be no distinction between a younger and an older woman. ');">⁹</span>

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