// NSDate *birthDate から現在までの年の差を求める(年齢を求める)
NSCalendar *calendar = [NSCalendar currentCalendar];
NSDateComponents *diffComponents
= [calendar components:NSYearCalendarUnit | NSMonthCalendarUnit | NSDayCalendarUnit
fromDate:birthDate
toDate:[NSDate date]
options:0];
NSInteger year = [diffComponents year];
NSLog(@"year:%d", year);
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