It would look like his age has been mis transcribed on the index I am looking at for the census in 1901. This is John's birth entry: John MCTURK born 15 MAR 1871 Hutchesontown, Glasgow, Lanark, Scotland
His parents John MCTURK and Catherine CONNELL were married on 15 JUL 1870 at Central District, Glasgow, Lanark, Scotland. Some census entries for them:
1871:John McTurk 27, railway stoker, b. Minnigton, Dumfrieshire
Catherine McTurk 22, b. Glasgow
John McTurk, under 1 month, b. Glasgow
Address: 12 Camden St, Hutchesontown, Glasgow Govan
1881:John McTurk 37, Railway Engine Driver, b. Moniaive (?spl), Dumfriesshire
Catherine McTurk 32, b. Glasgow
John McTurk 10, b. Glasgow
Robert McTurk 8, b. Glasgow
Jessie McTurk 5, b. Glasgow
James A McTurk 3, b. Glasgow
Alexander McTurk 1, b. Glasgow
Address: 191 Caledonia Rd, Glasgow Hutchesontown
1891:John McTurk 46, Railway Engine Driver, b. Meniaine, Dumfriesshire
Catherine McTurk 42
John McTurk 20, Railway Engine Stoker
Robert McTurk 18
Jessie McTurk 15
James McTurk 13
Alexander McTurk 11
Jane McTurk 8
Catherine McTurk 4
Isabella McTurk 2
David McTurk 5 Months
Address: 191 Caledonia Rd, Glasgow Hutchesontown
Monica