Our practice has a strict policy regarding vaccinations. Please read our Vaccine Policy to ensure our views align with yours. Recommended Immunization Schedule for Persons Aged 0 Through 18 Years United States, 2016. These recommendations must be read with the footnotes that follow. To view the immunization schedule, click here. For those who fall behind or start late, provide catch-up vaccination at the earliest opportunity as indicated by the green bars in on theimmunization schedule. To determine minimum intervals between doses, see the catch-up schedule. School entry and adolescent vaccine age groups are 4-6 yrs and 11-12 yrs.