<s>[INST] I am 58 years old. My brother is 9 years older than me. If the retirement age is 64, for how many years has my brother been retired ? [/INST] Your brother has been retired for 3 years:

58 + 9 - 64 = 3</s>\ <s>[INST] What about if my brother was only 2 years older than me? The retirement age stays the same. [/INST] 