According to the U-shaped curve of marital satisfaction:

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The U-shaped curve of marital satisfaction suggests that after the honeymoon phase, marital happiness steadily decreases until reaching its lowest point around the time when children are in their teen years. However, marital happiness then rises again at the empty nest stage, when children have left home, and couples have more time to focus on their relationship. This pattern has been observed in several studies and can provide insight into the challenges and opportunities of long-term relationships.

According to the U-Shaped Curve of Marital Satisfaction