Aged 21 in 1916 when married

The two George Percival Briths (is Merther Tydfal and Redruth) are before George's DOB).  There isnt a possible birth registered in Wrexham.  He may have been born in Warrington:

THOMAS, GEORGE  PERCY      - 
GRO Reference: 1894  D Quarter in WARRINGTON 
Volume 08C  Page 271

BARKER, ROSANNA        EVANS 
GRO Reference: 1897  M Quarter in WREXHAM 
Volume 11B  Page 280

THOMAS Rosanna of Alma House, Maderia Hill, Wrexham (wife of George Percival Thomas) died 15 Oct 1944.
Administration Bangor 13 Nov to the said George Percival Thomas, window cleaner.  Effects £196 19s 4d.

THOMAS, FANNY        BARKER 
GRO Reference: 1917  D Quarter in WREXHAM 
Volume 11B  Page 431

Name    Fanny Nicholls
Death Age    78
Birth Date    5 Dec 1917
Registration Date    Jul 1996
Registration district    Bangor, Gwynedd
Register Number    65B
District and Subdistrict    8411B
Entry Number    74

THOMAS, ROSANNA        BARKER 
GRO Reference: 1920  D Quarter in WREXHAM 
Volume 11B  Page 480

Name    Rosanna Ellis
Death Age    74
Birth Date    12 Nov 1920
Registration Date    Aug 1995
Registration district    Wrexham Maelor, Clwyd
Register Number    A87
District and Subdistrict    8131A
Entry Number    113

Although MMN = PARKER on the GRO, George Thomas Jnr was present on the 1939 register. PARKER is an error and should be BARKER.

THOMAS, GEORGE  PERCY      PARKER 
GRO Reference: 1924  J Quarter in WREXHAM
Volume 11B  Page 480

Name    George Percy Thomas
Death Age    68
Birth Date    12 Jun 1924
Registration Date    Sep 1992
Registration district    Wrexham Maelor
Inferred County    Clwyd
Volume    24
Page    807