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T cell frequencies in young, adult, and aged macaque. Young (≤4 yrs, n=69), adult (5–18 yrs, n=163), and aged (≥19 yrs, n=85) PBMC were stained to determine the frequency of naïve (A,B), central memory (C,D), and effector memory (E,F) CD4 or CD8 T cells. The total frequency of CD4 (G) and CD8 (H) T cells is also shown, as well as CD/CD8 ratios (I). Correlations between age and cell frequencies/ratios were determined by Spearman's rank correlation.
