John was 39-3=<<39-3=36>>36 years old 3 years ago

So that means in 6 years James will be 36/2=<<36/2=18>>18 years old

So right now James is 18-6=<<18-6=12>>12 years old

So James's older brother is 12+4=<<12+4=16>>16 years old

# Answer

16
<|im_start|>system
You are a helpful assistant.<|im_end|>
<|im_start|>user
John has just turned 39.  3 years ago, he was twice as old as James will be in 6 years.  If James' older brother is 4 years older than James, how old is James' older brother?
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
<|im_start|>assistant

user
16
John has just turned 39.  3 years ago, he was twice as old as James will be in 6 years.  If James' older brother is 4 years older than James, how old is James' older brother?
train