Question: is ad or bc older?
Answer: 1 AD is similar to zero on the number scale. All dates before it is are as BC (Before Christ), whereas all dates after it including it are as AD (Anno Domini - Latin for 'The Year of the Lord'). So, 2000BC is older than 1400BC which is older than 1AD older than 1400AD older than 2000AD, now simply called the year 2000.