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Whats your oldest egg?
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July 22, 2016.
Which is exactly 5 days after I started playing. :D
Put it in an incubator today and expect an level 5ish Pokemon.
PS: I only use the infinite incubator most of the time (no coins to buy more) and mainly get 5km eggs (>75%), so it was nearly impossible before the last update to find out which eggs are new.