What shows age of an object in V5

Hi,
V5
What shows age of an object.
I posted this then it says post deleted by author, now I never went anywhere near such deletion, wouldnt know how to.

In the ID number it ends in a bracketed number, one is a few numbers different from the other.
flared item (869)
staggered (874)

is that indicative ?

If I copy paste the two to a new file I get (4) for one of them so clearly it doesnt retain its unique number.

How else can I tell which one I made later ?

Layer names, both say revised !

Cheers

Steve