Changes

|colspan+ Volume of both testicles combined<br><font size=3| '''Testicular size by age''' 1>, on average ± standard error (ml)</font><ref name="PaniaguaMartín1987">{{cite journal|last1=Paniagua|first1=Ricardo|last2=Martín|first2=Agustín|last3=Nistal|first3=Manuel|last4=Amat|first4=Pedro|title=Testicular involution in elderly men: comparison of histologic quantitative studies with hormone patterns*|journal=Fertility and Sterility|volume=47|issue=4|year=1987|pages=671–679|issn=00150282|doi=10.1016/S0015-0282(16)59120-1}}</ref>