Given a document date, age is an important feature in disambiguating identity 
since it loosely relates to date of birth. It's also used in many situations 
where a date of birth would create personal privacy issues.

Most properties change over time. The LOD community has a bias for facts that 
are static or "true right now" and we're still working out how to deal with 
historical changes.

Rob
On 2013-06-14, at 7:11 AM, Richard Light wrote:

> Surely it's as pointless to record an age as a property, as it is to stop a 
> clock at the current time, and say "there, that's nailed it".  Current age is 
> the distance between two points in time, one fixed and one not (unless you're 
> talking about "age of a person when some other event, such as their death, 
> occurred").
> 
> Richard
> 
> -- 
> Richard Light


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