I agree with the sentiment but "and married" could skew this wildly for all we know, since marriage has changed a lot over that time period. It should be its own control variable!

I'm under 30, have a mortgage and a partner, but we're not planning on ever getting married! I suppose materialism impacts this; if we had the means for a wedding ceremony without it impacting long term financial plans maybe we would think differently (and our generation would too), but the institution of marriage has fallen out of favour with a lot people in my age bracket, regardless of means.