i dont know really.. i do now that dutch are getting 4,5 cm (1,77 inch) longer every generation. There are studies that place dutch people in the top ranking as far as height. Wich is funny because at some places our country is 6 meters (19,68 feet) below sealevel. So maybe were growing to compensate that. Anyway.. my point is, that fact we keep growing without an end in sight must be due to diet and lifestyle. I haven't found results that compare that to penis length though.