When did Mary die?

My question is specifically relevant to a study I am conducting to determine if it was plausibly possible that Luke had contact with Mary while in Paul's company. I know that Mary's death is not attested anywhere in scripture. The closest information we actually have is from Epiphanius, and later Hippolytus of Thebes, though likely derivative of Epiphanius, who both claim that she allegedly lived eleven years after the crucifixion (Epiph. *Pan*. 78.11; Hipp. Theb., *Chron*. *fr*. 48 (*PG* 117, 1029)). Given the average betrothal age of twelve or thirteen years old for a young woman in first century Judaea, if Jesus was born in 3 BCE relative to Luke's deduction from the fifteenth year of Tiberius, then he was born when she was either thirteen or fourteen years old. When you calculate that forward to 34 CE (which is the year I have personally determined for the crucifixion, though that is an entirety different discussion), eleven years later would put her death around 45 CE at approximately the age of sixty. Demographically, this is perfectly normal. While average life expectancy at birth in the Roman world was low, this is largely due to infant and child mortality; those who survived into adulthood frequently lived into their sixties or beyond. Thus, Mary’s surviving to her early sixties accords well with demographic realities, making the patristic calculation historically plausible (Bruce M. Metzger, The New Testament: Its Background, Growth, and Content, 3rd ed. (Nashville: Abingdon, 2003), 25; Keith Hopkins, Death and Renewal: Sociological Studies in Roman History, Volume 2 (Cambridge: Cambridge University Press, 1983), 225–27). However, for Luke to have had contact with her, either he was in Paul's company much earlier than Troas, which is where most scholars put it, or Mary lived longer than the tradition given by Epiphanius. The latter is not out of the question. A lot of his information is highly questionable. So, I'm trying, as best as I'm able, to deduce a competent approximation of the time of her death to either confirm or deny the plausibility of her having contact with Luke. The relevance of this contact has to do with the intimacy of knowledge Luke has concerning his infancy narrative. He is privy to details that could only have come from someone who knew them. Things like the offset of Mary's and Elisabeth's pregnancies, or that Mary stayed with Elisabeth for three months, are not details that could have been acquired from the public records. I did read somewhere some time ago a passage that I recollect was in a patristic writing, though it's possible it was in one of the New Testament epistles. The scene mentions young women who wanted to meet with and talk with Mary about private, secret, or mysterious things. The implication is that they wanted to discuss her virginity or similar. As best as I can recall, this passage, wherever it is, provides a minor temporal time-stamp that gives a clue to the longevity of Mary's life. I know I read it. It's not my imagination. But I have tried searching for it in every way I can think to word it. I can't find it anywhere. Anyone who knows the source of what I'm looking for, I would be greatly obliged if you would share. Outside of that, any solid arguments on the time of Mary's death would be great. I don't care if it supports or undermines my thoughts concerning Luke's contact with her. I just want a factual conclusion, as best as can be had within the bounds of credible evidence.