User blog comment:Master Sima Yi/Assassinews 05-08-'14 – Assassin's Creed: Rogue announced/@comment-92.55.153.135-20140807150228/@comment-86.61.8.174-20140808042754

I think that Shay is Haytham's age.He looks around 30 to me.So that would mean he is born in 1720s,or early 1730s.