My 5 and 2 year old have had zero vaccinations. They have been extremely healthy in comparison to their fully vaccinated same age cousins as well as compared to the early childhood history of their fully vaccinated older brothers. My 5 yr old has never been on antibiotics and have only gone to the doctor a handful of times, once for stitches and once for a broken bone. My 2 yr old was on his first antibiotic at 20 months for a stubborn ear infection that wouldn't clear with home care.
Compare that to my older vaxed kids who were on antibiotics multiple times in their first year for ear infections, prone to croup, two were hospitalized due to dehydration due to a nasty GI virus (even though they were both EBF). They also all struggle with allergies, asthma, skin issues, etc. We don't have those issues with our younger two. They do get the occasional cold but they get over it quickly and without complications. Stomach viruses are over in a day or less. Its great having healthy kids!