It's much worse than the article suggests. The article doesn't explain why people don't marry. People who marry before middle-age often have secure attachment styles. The dating pool from middle age on consists primarily of people with insecure attachment styles. Relationships with insecurely attached people are especially problematic. If you're not married, but want to be, look for widows or widowers with secure attachment styles, and work on developing secure attachment.

https://www.amazon.com/Attached-Science-Adult-Attachment-You...

https://www.amazon.com/Attachment-Disturbances-Adults-Treatm...