<prompt> What is the approximate weight of thymus gland at pubey?15 gms35 gms25 gms55gms  <response>: The thymus is largest and more active during the neonatal and pre-adolescent periods. By the early teens, the thymus begins to atrophy and thymic stroma is replaced by adipose tissue. Neveheless, residual T lymphopoiesis continues throughout adult life. The thyroid reaches maximum weight 20-37 grams by the time of pubey. Age Mass Bih about 15 gms Pubey About 35 gms Twenty- five years 25 gms Sixty years 15 gms Seventy years as low as 5 gms 