But after the canonical gospels she disappears without a trace. French legend and Dan Brown sent her to Marseille. Eastern Orthodox tradition has her accompanying St. John to Ephesus, where she got old and died. But really sick puppies such as myself like to think of her crucified butt naked soon after that crazy carpenter.
While certainly in the "apochryphal" tradition ( but that's at least a century later and mostly later than that) she is linked "romantically" to Jesus (i.e. is about the same age) , one book I read points out that the New Testament says almost nothing about her, including her age. It said she could have been "80 years old, with a maternal instinct for unkempt young men". Luke's Acts (which you can't really trust anyway since it contradicts what Paul says about himself in Galatians) mentions "Mary the mother of Jesus" and "the women" at Pentecost, but doesn't mention her specifically. She is in all the Resurrection accounts, however, albeit sometimes in a company, sometimes alone.
Robin Lane Fox in "The Unauthorized Version" asked whether Jesus himself was older. "You are not yet 50 years old, and you have seen Abraham?" "Amen I say to you, before Abraham came to be, I am." Fox points out that nobody over 50 had seen Abraham either, so why pick that age unless Jesus looked it.
It would be interesting to learn what these people were really like. They did indeed take risks to found a movement, and they were successful, although it wasn't at all unified. There was a lot of tension--Paul keeps mentioning "false brothers", and fights with Peter over whether the converts need to follow Jewish law to be accepted. Apparently some "false brothers" stirred up a lot of trouble in Corinth against Paul. The apostles certainly got monetary assistance, but didn't get rich, so profit as in American megachurches wasn't the sole driver. They disagreed among themselves. Luke's Jesus isn't the same as Matthew's or even Mark's, and John's Jesus is altogether different. John's Jesus doesn't go to "the garden" to pray in agony--he's there because he needs to show up to get on with the script. When they "arrest" him, "they fell down before him". The apostles don't need to try to protect him with Peter's sword. Jesus carries the cross "for himself", no need for Simon of Cyrene (Mark even names his sons who "are with us", but John doesn't have a word about him). Jesus runs the whole show in John.
Obviously the early Christians wondered about these folks too, which is why there are so many stories about them and about what Jesus was like as a child. Well, I guess we'll never know unless or until we get to Paul's "third heaven". (From zekes graphics on Deviant Art)