This discussion about age raises an interesting question: do we read Gemora as a strictly legal cases or as a guide of living. Strictly legal reading defines edge cases indeed. For example, just had in the daf, a Rav goes to another city to ask a shaila about a posuk, the Teacher is not there, so he goes to another city.
You can learn from this what the pasuk says and some halochos of gezera shava – but you can also learn about an admirable attitude of dropping everything and travelling to get an answer to your question. When someone questioned R Salanter where his chidushim were from, he said “from Gemora”. The questioner was surprised – I do not know these Gemorahs [you can see here that the guy knew whole Gemora to say that!]. R Salanter said – it says so in _my_ Gemorah. I think he is talking about this expansive way of reading about lives of Tannaim and Amoraim.
This is not to defend my conjecture about ages of marriages, of course 🙂