Another thought: if she gave a set age, it might correlate with the Saturn cycle. If Saturn is your seventh house ruler (it is if your DC is in Capricorn or Aquarius, which it would be if you have Cancer or Leo rising), or if it's in your seventh house, developments around marriage are likely to correlate with Saturn reaching one of its corners: a return, an opposition, or a square. If you are no youngster, the age she was pointing to was probably 58 (second Saturn return) or 45 (second Saturn opposition). If it was anything else, we could be looking at one of the other midlife transits.
But that, too, does not guarantee that you'll get married. It just may be a contributor to opening the window of possibility.