Sexually transmitted infections are becoming more common in older adults.Rates of chlamydia, gonorrhea and syphilis in people ages 55 and up more than doubled in the U.S. over the 10-year period from 2012 to 2022, according to data from the Centers for Disease Control and Prevention. The number of syphilis cases among people ages 55 and up increased seven-fold during those 10 years, while gonorrhea cases increased nearly five-fold and chlamydia cases more than tripled during that time. A presentation to be delivered Thursday — part of a lead-up event to the European Congress of…