noun
late-life divorce; divorce after many years of marriage
Often refers to divorce around retirement age, especially when the husband retires and the couple spends more time together. Colloquial term.
定年を機に熟年離婚する夫婦が増えている。
More couples are getting a late-life divorce upon retirement.
Compound of 熟年 (mature age) and 離婚 (divorce). The term became widely used in the early 2000s.