Quick Answer

STD rates vary dramatically by age: teens and young adults (15-24) account for half of all new STIs despite being only 25% of the sexually active population. Seniors (65+) have rising rates as dating resumes after divorce or widowhood, and college campuses concentrate sexually active young adults in testing-accessible environments.

  • Ages 15-24: half of all new STIs; chlamydia rates highest in women 20-24.
  • College students: high STI rates driven by partner turnover and inconsistent condom use.
  • Ages 45+: rising STI rates as divorce and dating apps increase new partner exposure.
  • Seniors (65+): STI rates have doubled in the past decade, driven by longer, healthier sex lives.

Context Most Pages Skip

Age patterns reflect behavior more than biology. Young adults have more partners, test less consistently, and use condoms less reliably. Older adults returning to dating after long-term relationships often lack STI awareness.

What to do at each age

Teens/college: annual chlamydia/gonorrhea screening, HPV vaccine, condoms. Midlife divorce: full panel before new relationships, condoms with new partners. Seniors: same rules apply — STIs do not age out.

⚕️ This page is educational and does not replace advice from a licensed clinician. If you may have been exposed to an STI, get tested — most infections are manageable, and many are fully curable.

Sources & Further Reading

Figures reflect CDC surveillance and WHO estimates; they are population statistics, not personal risk predictions.