Fullback
Player Age Opposition Ground Date Match
GH McAllan 18y 13d v Scotland Lansdowne Road 15 Feb 1896 Details
WW Pike 19y 14d v England The Oval 24 Mar 1879 Details
JM O'Sullivan 18y ?d v Scotland Edinburgh 16 Feb 1884 Details
H Moore 19y 184d v England Dublin 13 Dec 1875 Details
R Henshaw 19y 361d v USA Houston 8 Jun 2013 Details
DB Walkington 20y 11d v England Lansdowne Road 5 Feb 1887 Details
PE O'Brien-Butler 20y 39d v Scotland Edinburgh 20 Feb 1897 Details
GH Wheeler 20y 60d v England Manchester 7 Feb 1885 Details
EC Ridgeway 20y 164d v Scotland Murrayfield 27 Feb 1932 Details
RB Walkington 20y 191d v England The Oval 15 Feb 1875 Details

Wing
Player Age Opposition Ground Date Match
JT Brett 18y 218d v Wales Belfast 14 Mar 1914 Details
JH Gage 18y 331d v Scotland Murrayfield 27 Feb 1926 Details
TR Hewitt 18y 362d v Wales Cardiff 8 Mar 1924 Details
EF Campbell 19y 32d v Scotland Inverleith 18 Feb 1899 Details
LM Fitzgerald 19y 74d v Pacific Is Lansdowne Road 26 Nov 2006 Details
SL Waide 19y 189d v England Lansdowne Road 13 Feb 1932 Details
DJ Cussen 19y 208d v England Twickenham 12 Feb 1921 Details
JT Doyle 19y 284d v Wales Belfast 9 Mar 1935 Details
F Bennett 19y 299d v Scotland Inverleith 22 Feb 1913 Details
DSJ Bowen 19y 339d v Wales Cardiff 15 Jan 1977 Details

Centre
Player Age Opposition Ground Date Match
AH Bailey 18y 68d v Wales Swansea 10 Mar 1934 Details
GV Stephenson 18y 103d v France Lansdowne Road 3 Apr 1920 Details
D Hewitt 18y 131d v Australia Lansdowne Road 18 Jan 1958 Details
JB Allison 18y 221d v England Lansdowne Road 4 Feb 1899 Details
AJFK O'Reilly 18y 260d v France Lansdowne Road 22 Jan 1955 Details
FFS Smithwick 18y 338d v Scotland Belfast 19 Feb 1898 Details
AR McKibbin 19y 2d v Wales Cardiff 15 Jan 1977 Details
AC Pedlow 19y 53d v Wales Swansea 14 Mar 1953 Details
LB McMahon 19y 72d v England Twickenham 14 Feb 1931 Details
FS Hewitt 19y 133d v England Lansdowne Road 13 Feb 1926 Details

Fly-half
Player Age Opposition Ground Date Match
FS Hewitt 17y 157d v Wales Cardiff 8 Mar 1924 Details
FMW Harvey 18y 189d v Wales Cardiff 9 Mar 1907 Details
RA Lloyd 18y 192d v England Twickenham 12 Feb 1910 Details
WM McCombe 18y 355d v France Colombes 27 Jan 1968 Details
AH Bailey 19y 39d v England Twickenham 9 Feb 1935 Details
WA Cunningham 19y 352d v Wales Cardiff 13 Mar 1920 Details
LB McMahon 20y 15d v South Africa Lansdowne Road 19 Dec 1931 Details
EO Davy 20y 231d v Wales Belfast 14 Mar 1925 Details
BJ McGann 20y 242d v France Lansdowne Road 25 Jan 1969 Details
JB Murray 20y 298d v France Lansdowne Road 26 Jan 1963 Details

Scrum-half
Player Age Opposition Ground Date Match
JMT Quirke 17y 229d v England Twickenham 10 Feb 1962 Details
AA Mulligan 19y 358d v France Colombes 28 Jan 1956 Details
CJ Scally 20y 37d v Romania Lansdowne Road 21 Nov 1998 Details
JC Robbie 20y 61d v Australia Lansdowne Road 17 Jan 1976 Details
JB Gardiner 20y 106d v England Leicester 10 Feb 1923 Details
BT O'Meara 20y 330d v Scotland Murrayfield 1 Mar 1997 Details
R Carroll 20y 350d v France Lansdowne Road 25 Jan 1947 Details
JH Burgess 21y 94d v France Colombes 28 Jan 1950 Details
HM Read 21y 96d v England Twickenham 12 Feb 1910 Details
PF Murray 21y 186d v France Colombes 1 Jan 1927 Details

Prop
Player Age Opposition Ground Date Match
C Teehan 19y 281d v England Twickenham 11 Feb 1939 Details
H Kennedy 20y 240d v Scotland Murrayfield 26 Feb 1938 Details
TAA Headon 20y 249d v Scotland Lansdowne Road 25 Feb 1939 Details
AW Courtney 20y 285d v Scotland Inverleith 28 Feb 1920 Details
P O'Callaghan 20y 302d v Australia Lansdowne Road 21 Jan 1967 Details
JJC Bermingham 21y 116d v England Twickenham 12 Feb 1921 Details
WJ Beatty 21y 156d v France Parc des Princes 28 Mar 1910 Details
DB O'Loughlin 21y 214d v England Lansdowne Road 12 Feb 1938 Details
AM Buchanan 21y 268d v England Lansdowne Road 13 Feb 1926 Details
S Walker 21y 295d v England Lansdowne Road 10 Feb 1934 Details

Hooker
Player Age Opposition Ground Date Match
WP Collopy 19y 241d v France Parc des Princes 1 Jan 1914 Details
JJ Clune 19y 314d v South Africa Lansdowne Road 30 Nov 1912 Details
KD Mullen 20y 60d v France Lansdowne Road 25 Jan 1947 Details
JC Blackham 20y 132d v Scotland Inverleith 27 Feb 1909 Details
CT Payne 20y 179d v England Lansdowne Road 13 Feb 1926 Details
HH Coulter 21y 73d v England Lansdowne Road 14 Feb 1920 Details
JL Cantrell 22y 7d v Australia Lansdowne Road 17 Jan 1976 Details
WF Browne 22y 16d v England Twickenham 14 Feb 1925 Details
JS Dick 22y 109d v England Twickenham 10 Feb 1962 Details
KGM Wood 22y 129d v Australia Brisbane 5 Jun 1994 Details

Lock
Player Age Opposition Ground Date Match
JR Brady 20y 13d v Scotland Murrayfield 24 Feb 1951 Details
RH Thompson 20y 217d v South Africa Lansdowne Road 8 Dec 1951 Details
JJ Clune 20y 345d v France Parc des Princes 1 Jan 1914 Details
MG Molloy 21y 124d v France Colombes 29 Jan 1966 Details
J Ryan 21y 124d v Argentina Lansdowne Road 25 Nov 2017 Details
IMB Stuart 21y 144d v England Belfast 9 Feb 1924 Details
DE Spring 21y 151d v Scotland Lansdowne Road 21 Jan 1978 Details
J Russell 21y 185d v France Colombes 1 Jan 1931 Details
RE Casey 21y 202d v England Twickenham 5 Feb 2000 Details
DB O'Loughlin 21y 228d v Scotland Murrayfield 26 Feb 1938 Details

Flanker
Player Age Opposition Ground Date Match
KG Goodall 20y 79d v Australia Sydney 13 May 1967 Details
TA McClelland 20y 186d v England Twickenham 12 Feb 1921 Details
JM Neill 20y 227d v France Belfast 23 Jan 1926 Details
NAA Murphy 20y 330d v Australia Lansdowne Road 18 Jan 1958 Details
JF Slattery 20y 332d v South Africa Lansdowne Road 10 Jan 1970 Details
AG Foley 21y 83d v England Lansdowne Road 21 Jan 1995 Details
ERP Miller 21y 103d v Italy Lansdowne Road 4 Jan 1997 Details
WI Henderson 21y 107d v USA Houston 8 Jun 2013 Details
S Ferris 21y 116d v Pacific Is Lansdowne Road 26 Nov 2006 Details
JA Donaldson 21y 124d v Australia Lansdowne Road 18 Jan 1958 Details

No. 8
Player Age Opposition Ground Date Match
GR Beamish 19y 291d v England Twickenham 14 Feb 1925 Details
KG Goodall 19y 332d v Australia Lansdowne Road 21 Jan 1967 Details
ERP Miller 21y 117d v France Lansdowne Road 18 Jan 1997 Details
JAE Siggins 21y 187d v France Colombes 1 Jan 1931 Details
ML Hipwell 21y 210d v England Twickenham 10 Feb 1962 Details
S Ferris 21y 304d v Argentina Buenos Aires 2 Jun 2007 Details
SD Corkery 21y 364d v USA Lansdowne Road 5 Nov 1994 Details
JR Kavanagh 22y 3d v France Belfast 24 Jan 1953 Details
TAP Moore 22y 14d v Australia Sydney 13 May 1967 Details
T McGrath 22y 159d v Wales Lansdowne Road 10 Mar 1956 Details

Substitute (excluding unused substitute)
Player Pos Age Opposition Ground Date Match
R Ruddock (N8) 19y 225d v Australia Brisbane 26 Jun 2010 Details
GW D'Arcy (C) 19y 247d v Romania Lansdowne Road 15 Oct 1999 Details
LM Fitzgerald (FB) 19y 262d v Argentina Buenos Aires 2 Jun 2007 Details
R Henshaw (C) 20y 3d v Canada Toronto 15 Jun 2013 Details
CJ Scally (SH) 20y 30d v Georgia Lansdowne Road 14 Nov 1998 Details
JA Hewitt (C) 20y 190d v South Africa Cape Town 30 May 1981 Details
J Larmour (C) 20y 245d v Italy Lansdowne Road 10 Feb 2018 Details
WI Henderson (F) 20y 263d v South Africa Lansdowne Road 10 Nov 2012 Details
BG O'Driscoll (C) 20y 267d v Romania Lansdowne Road 15 Oct 1999 Details
BT O'Meara (SH) 20y 316d v England Lansdowne Road 15 Feb 1997 Details

Only the player's first appearance listed; Only includes matches where the player starts in the respective position, and excludes matches as a substitute.

Records include the following current or recent matches:
Ireland v Russia at Kobe, Rugby World Cup, Oct 3, 2019 [0-0]
Ireland v Scotland at Yokohama, Rugby World Cup, Sep 22, 2019 [0-0]
Ireland v Wales at Lansdowne Road, 2nd Test, Sep 7, 2019 [0-0]