There are definitely more people living together, and either getting married years later, or never marrying in my country.
Having said that, recently I have been to 4 or 5 weddings, where people have lived with partners for around 15-18 years,had children, but haven't married. They then have separated from their partners, have met somebody else, and have married that new person within a year!
I can't make my mind up what this is about, but it seems to be happening quite regularly.
Now, whether it is because they haven't felt that the first person was the right person for them to marry, or whether, after splitting up after all those years they suddenly think that life is passing them by, and act upon it, who knows?
I can't work it out!