The evolution of who gets HPV vaccines is really interesting. At first it was young women, as vaccinating young men had a very marginal decrease in cervical cancer rates via indirect protection (which itself is a function of how many young women are vaccinated). Then as HPV infection was linked to more cancers, vaccinating young men crossed the cost-effectiveness thresholds many governments use.

Vaccinating older populations is similarly just a less clear-cut case, but it's a cost-effectiveness argument, not one purely driven by if the vaccine offers protection.