ANOVA degrees of freedom in R with reshape2 melt

Question

The following is a subset of my data set:

structure(list(Age = structure(c(2L, 2L, 2L, 2L, 2L, 2L, 2L, 
2L, 2L, 2L, 1L, 1L, 2L, 2L, 2L, 2L, 2L, 2L, 2L, 2L), .