Current CDC ACIP recommendation: routine HPV vaccination at age 11-12 (can start as early as 9). Two-dose schedule (0 and 6-12 months) for those starting before age 15; three-dose schedule for those starting at or after age 15. Vaccinating before HPV exposure produces the highest seroconversion. HPV causes cervical, vulvar, vaginal, anal, penile, and oropharyngeal cancers — both sexes benefit. Statement 1 misstates the schedule, statement 2 is wrong (it is 2 doses for under-15 starters, 3 for older), and statement 4 is outdated and incorrect — HPV is recommended for ALL adolescents regardless of sex.
In-depth explanation
The single highest-yield NCLEX trap on HPV is "boys don't need it." HPV-related oropharyngeal cancers in men now exceed cervical cancer cases per year in the US. Both sexes get the vaccine; younger is better; 2 doses if started before 15, 3 doses if started at 15 or older.
For study reference only. Always follow current clinical guidelines and your institution’s protocols.