To be honest I always have to smile a little bit, when the Queen says (and she says it quite often) that the Bernadottes become so old. You can´t predict one´s death. This depends on so many things...how you lead your life (nourishment, sports, smoking), how much you love your life (ppl, who don´t see a sense in their life die earlier) also on genes (but every Bernadotte has also the genes from the mother-side), medical care also plays a role (a Royal get the best specialists...and they often try to prolong life, even to a point, on which the Royal patient vegetates more than he/she lives). Except that there´s always the danger of an accident.
Of course I hope the current Bernadottes have a long and satisfied life, but (un)fortunately it´s not predictable.