The reproductive system in elderly men.
D000368:Aged; D002648:Child; D002940:Circadian Rhythm; D013006:Growth Hormone / Q000378:metabolism; D006801:Humans; D007986:Luteinizing Hormone / Q000097:blood; D008297:Male; D008875:Middle Aged; D011388:Prolactin / Q000378:metabolism; D012098:Reproduction; D013739:Testosterone / Q000378:metabolism*
D013739:Testosterone; D011388:Prolactin; D007986:Luteinizing Hormone; D013006:Growth Hormone