Revised 03–2016. and varicella vaccine should be administered for the first dose in this age group. •For the second dose of measles, mumps, rubella, and varicella vaccines at any age (15. months--12 years) and for the first dose at age ≥48 months, use of MMRV vaccine generally is. preferred over separate injections of its equivalent component vaccines (i.e., MMR vaccine.