A recent article describes eight different types of studies that support the smaller is healthier and longer-lived thesis. Paper appeared in the Journal of Scientific Research & Reports (2014).
See publication list.
A large, long-term longitudinal study found that shorter elderly men live longer. See: He, Morris, Grove et al. (2014). Shorter men live longer: association of height with longevity and FOXO3 genotype in American men of Japanese ancestry.
PLoS ONE 9(5): e94385. doi; 10.1371/journal.pone.0094385