Some people especially women believe that marriage can be a fairy tale story,..,,... most women dream of their weddings. what flowers. which church... who will be the maid of honor.,.,.etc.
In this case i believe that they both have been through a lot in the age of 70. So many things they have seen and learn and experience. So why not getting married which is something they have never done....and beside that... there's nothing wrong when it's come to a real love marriage.
Also in the mean kind of way... i personal believe that it's a deal or no deal case...with their ages maybe this is the last flight out... maybe their health will not help at all if they getting older... Imagine the bride walk along the hire with walking stick according to the gout situation on her knees or the groom walking with diaper inside his perfect Hugo Tux.
So yeah... when all the time they have in the world seem to be shorter than they thought it was... let's spend it for the good sake of memories..

Yes.... You really think this song is about you, don't you? so go on... if you think you are better... Bark.. Bark Louder... maybe whatever came from your mouth might hurt people's feeling but show what kind of human you really are.