Again, in this particular culture and economy, there wasn't much of a need to think about large numbers precisely. I suppose so, but there's a reason I picked

Again, in this particular culture and economy, there wasn't much of a need to think about large numbers precisely. I suppose so, but there's a reason I picked 87 years. It's a time-scale that we care about when talking about people and society. We don't strictly need precise numbers for that you could say "around when granddad was born" -- but if we do have precise numbers then we can and will use them.