Is Missed Periods After Fifty Sign Of Menopause?

Hi! This is anju. Iam 50 years old height 5'4". Since a three month my period has been stopped.I have confirmed I am not pregnant. I think it has happened reason my age.But I am afraid in that condition about my sex condition. Still now my sex condition is normal. My question is how long will be normal.If I loose my temper than how I will get sexual tendency.