Silcocks was born on 5 May 1993,[1] and is from Melbourne's southeastern suburb[2][3] of Mount Waverley, Victoria.

[1] He is a member of the Knox Athletics Club and is coached by Richard Huggins.

[1] At the 2009 Australian AWD Underage Championships, he earned two gold medals.

[1] At the 2010 Australian AWD Underage Championships, he earned three gold medals.

[8] At the 2011 Arafura Games, he finished first in the men' 400m ambulant event with a time of 53.69 seconds.