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Also you could check here https://store.steampowered.com/account/licenses/ for your oldest activated game license, in case you bought or started a game on your first Steam day.
Could you please elaborate on what you mean by "Confirmation email"?
Another thing that came to my mind are external analysis sites like steamdb. Although I am not sure, if they can get the registration date out of a private account.
This worked for me, thanks so much!
20/11/2016
Yup, thanks again!