Red meat is definitely correlated with shorter lifespans, see e.g. http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2803089/. Causes appear to include increased risk of certain types of cancer and cardiovascular disease.

The causal links are obviously much harder to tease out, but the correlation between eating red meat and a shorter lifespan is strong enough that it shouldn't be a controversial statement.