Python death age generator

#This is my death generating program! Created by Daniel Williams, feel free to use and share improvments!
import random
print('This is a program to guess your death age!')
age = int(input('How old are you? '))
print('So you are %s years old?'% age)
userinput = input('NO CAPS: Yes or No?: ')
if userinput == 'no':#Loops from here :)
    print('You made a mistake!')
    print('Restart the program')
    raise SystemExit #Remember for test, ends code.
elif userinput == 'yes':
    if age > 129:
        print('I doubt you have lived this long ;)')
    elif age > 50:
        death_age = age + random.randint(1,60)
        print ('You will die, aged: %s' % death_age)
        reason_of_death = random.choice(['Over Eating','A Car Crash','Murder','Natural Causes','An Accident','Your Terrible Cooking'])
        print('You will die because of: %s' % reason_of_death)
    else:
        death_age = age + random.randint(1,90)
        print ('You will die, aged: %s' % death_age)
        reason_of_death = random.choice(['Over Eating','A Car Crash','Murder','Natural Causes','Your Terrible Cooking'])
        print('You will die because of: %s' % reason_of_death)