Natural testosterone levels fall slowly with age and fall rapidly following surgical removal of the testicles (for example in the treatment of testicular cancer).
Heerarka testosteron-ka ah ayaa si tartiib ah u dhacaya da'da isla markaana u dhacaya si dhakhso ah kadib marka qalliin looga saaro xiniinyaha (tusaale ahaan daaweynta kansarka tijaabada).