She has been writing about these topics for more than 20 years. When Jennifer Flavin filed for divorce from Sylvester Stallone in a Palm Beach, Florida, courthouse Aug. 19, the move surprised many.

Sylvester Stallone and Jennifer Flavin are one of Hollywood's longest enduring celebrity couples. Flavin was 19 when she met Stallone in 1988, who was already in his 40s. Despite their age gap ...