See above in red.a. John retired at the age of 56.

b. John retired at the age of 56 years.

c. John retired at the age of 56 years old.

Are the three sentences above all correct? Which is more commonly used? Do you think the "years old" here is redundant?

Yes, "years old" is redundant in b and c. If you want to use "years old", don't use "the age of". Say "John retired at 56 years old". However, note that you can also say "John retired at 56". It is understood that you are talking about his age.

e. Military conscription is required of all Israeli citizens between the ages of 18 and 25.

f. Military conscription is required of all Israeli citizens between the ages of 18 and 25 years.

g. Military conscription is required of all Israeli citizens between the ages of 18 and 25 years old.

Are the three sentences above all correct? Which is more commonly used? Do you think the "years old" here is redundant?

Same answer as above.

Student or Learner

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