This research was conducted in teak plantations in Southern and Central Benin, in order to characterize the structure of their dendrometric parameters and diameter class distribution according to their age and soil type. On the basis of a systematic sampling system with a square mesh of 100 m x 100 m, plantations aged of 5, 10, 15, 25 and 35 on different types of soil were inventoried through 20 mx 15 m plots for stands of less than 15 years old, and 30 m x 30 m for 15 years and older stands. According to the main results, the average values of the densities range from 114 to 1107 trees / ha, the diameter from 6.03 to 39.12 cm. The average height was from 5.8 to 23.47 m while the dominant height ranged from 7.01 to 23.71 m; the basal area was from 3.23 to D. GNANGUENON-GUESSE et al. / Int. J. Biol. Chem. Sci. 11(5): 2119-2132, 2017 2120 16.83 m 2 / ha and the spacing factor from 23.81 to 50.95 %. The best silvicultural performances were noticed on vertisol. We conclude that age and type of soil have effect on stands parameters and structures.