Alfred John's attestation papers for WW1 give his age as 22 (in 1915), married with 3 children. He was living at 85 Hardwick St., Barking, and his occupation was "Dust Collector".

I believe this is Alex' immigration on the SS Tunisian in Mar 1907. There are almost 11 pages of "Barnardo Children" on this sailing, which brought Alex to Halifax.
I am attaching pg. 17, where Alex' name appears (abt. line 23), and the face page of the shiplist which shows the ship name, sailing dates etc.