Median duration of first marriage for American women is 20.8 years and for remarriage is 14.5 years, with the South and Midwest having longer median durations in both cases. West and East have shorter median durations.
Pdf report with more details on marriage duration here.
Longer life expectancy means the current later marriage ages aren’t so bad, since it means longer marriages. Men have 15 or more years on their 1890 counterparts and women have decades more on theirs.
The takeaway is that divorce isn’t as rampant as some make out and marriages are lasting pretty long, and, well, Americans have been taking the fertility hit to marry later and in a better financial position for a long long time except for a brief 15 year blip.