Mama Mia At a brief look without checking out my astro sftwr.
... 1 thing to consider is that they have been together 13 years .. that be near to a Saturn opposition in their composite chart ... also at some point Pluto would have been (or is) at a challenging angle to her Saturn ... maybe have a look at their respective (+ the 'composite)
outer planetry transits + the respective .. if any.. 'progressions'
... also at some point Pluto would have (or is ) at a square aspect to his Sun ... also Saturn has being doing a number recently as it went retrograde by 20 degree ( is now 'direct' again) .. it may have been squaring her Moon and Venus possibly thrice ... and her natal 4th house Saturn ...
... also check out the chart data when their relationship / marriage started
idea .. would be a lot easier to check this out ( for moi .. in any case) if the actual birthdata could be posted i.e. dates .. times .. birthplaces
or e-mail the data to kozmos@blueyonder.co.uk ( and put the numeral six between 'kozmos' and the @ symbol .. or it will go missing ) and i shall endeavor to take a closer look ...'n post back what info i can
to take a proper look at the transits .. would need the degrees 'n minutes of their planetary placements
... outer planetry transits have a reputation in relationship breakups ... Saturn .. Uranus ... Pluto can really put on testing pressure by the more difficult transits i.e square .. opposition .. 'n poss. the cojunction ... especialy to the natives personal planets
also midpoint transits and such could be considered
also .... Uranus may have been at a difficult angle to their Sag and Virgo placements .. and conj. the Pisces
all the poss. 'n maybe's .. are 'cause need specific data to look at ... those 'outer planets ' move rather slowly
there be a bit of rudimentry info on transits at www.happydragon.pwp.blueyonder.co.uk .... there be a lot 'o info missing as well
suggestion ... research as much as you can .. by many different authors .. via libraries etc .. on the nature and meaning of the various transits
and their effect on relationships
all the best
Si @ HD
ps ..lovely ... just about missed the age gap there