Thought I would put each country for the players that could qualify that played in the 70s. The tough one is always who was peak in the 60s and who was peak in the 80s. So just going to leave this here to reference. Year of birth followed FC cricket span.
What an era.
Windies
Greenidge 1951 (70-92)
Fredericks 1942 (63-83)
Haynes 1956 (76-97) Mainly 80s
Rowe 1949 (68-82)
IVA Richards 1952 (71-93)
Kallicharan 1949 (66-90)
Gomes 1953 (71-88)
Lloyd 1944 (63-86)
Sobers 1936 (52-74) Mainly before 70s
D.Murray (wk) 1943 (60-81)
Roberts 1951 (69-84)
Garner 1952 (75-88)
Holding 1954 (72-89)
Croft 1953 (71-82)
Marshall 1958 (77-96) Mainly 80s
Lance Gibbs 1934 (53-75) Mainly before 70s
Played deep into 60s : Hunte, Butcher, Nurse, Kanhai, Hall, Griffith
Played from early-mid 80s : Richardson, Dujon, Walsh, Paterson etc
South Africa
B.Richards 1945 (64-83)
J.Cook 1953 (72-95)
Fotheringham 1953 (71-90)
Ackerman 1947 (63-82)
P.Kirsten 1955 (73-97) Mainly 80s
G.Pollock 1944 (60-87)
McEwan 1952 (72-92)
K.McKenzie 1948 (71-88)
Irvine (wk) 1944 (62-77)
Jennings (wk) 1954 (73-93)
Barlow 1940 (59-83)
Rice 1949 (69-94)
M.Procter 1946 (65-89)
van der Bijl 1948 (67-83)
Le Roux 1955 (75-89) Mainly 80s
Hanley 1952 (70-87)
Hobson 1951 (70-85)
Kourie 1951 (70-89)
Into the mid to late 60s : Bland 1938 (56-74) , Lindsay 1939 (58-74), Goddard 1931 (52-70), P.Pollock 1941 (58-72), Bacher 1942 (59-74), Trimborn 1940 (61-76)
70s into 80s : Jefferies 1959 (78-94) , Van Zyl 1961 (81-94)
New Zealand
Edgar 1956 (75-90) Mainly 80s
Turner 1947 (64-83)
Wright 1954 (75-93)
Howarth 1951 (71-86)
Burgess 1944 (63-80)
Congdon 1938 (60-78)
Coney 1952 (71-87)
Wadsworth (wk) 1946 (68-76)
Hadlee 1951 (71-90)
L.Cairns 1949 (71-85)
Chatfield 1950 (73-90)
Collinge 1946 (63-78)
J.Bracewell 1958 (78-90) Mainly 80s
Into mid to late 60s : Sutcliffe, Reid, Motz
Tests from 80s : Crowe, Smith
England
Amiss 1943 (60-87)
Gooch 1953 (73-00)
Gatting 1957 (75-98) Mainly 80s
Boycott 1940 (62-86) Mainly 60/70s
Cowdrey 1932 (50-76) Mainly before 70s
J.Edrich 1937 (56-78) Mainly before 70s
Denness 1940 (59-80) Mainly before 70s
K.Fletcher 1944 (62-88)
Gower 1957 (75-93) Mainly 80s
D'Óliveira 1931 (64-80) Mainly 60s/70s
Greig 1946 (65-78)
Botham 1955 (74-93) Mainly 80s
Knott (wk) 1946 (64-85)
Willis 1949 (69-84)
Snow 1941 (61-77)
Old 1948 (66-86)
Dilley 1959 (77-92) Mainly 80s
Arnold 1944 (63-82)
Lever 1940 (60-76)
Hendrick 1948 (69-84)
Underwood 1945 (63-87)
Titmus 1932 (49-82)
Emburey 1952 (73-97) Mainly 80s
Edmonds 1951 (71-92) Mainly 80s
Illingworth 1932 (51-83)
Into the mid to late 60s : Barrington, Graveney, Dexter, Trueman, Statham, Lock
Played from 80s : Lamb (but if in SA probably debuts in the 70s)
Australia
Redpath 1941 (61-76)
Wood 1956 (76-92) (Mainly 80s)
Border 1955 (76-96) (Mainly 80s)
I. Chappell 1943 (61-80)
G.Chappell 1948 (66-84)
Walters 1945 (62-81)
Simpson 1936 (52-78)
Yallop 1952 (72-85)
Hughes 1954 (75-91)
Stackpole 1940 (59-74)
R.Marsh (wk) 1947 (68-84)
Lillee 1949 (69-88)
Thomson 1950 (72-86)
Walker 1948 (68-82)
Hogg 1951 (75-85)
Ashley Mallett 1945 (67-81)
Bruce Yardley 1947 (66-90)
* Wessels 1957 (73-00) but in SA probably test debuts in 70s
Played late in 60s or early 70s : Lawry, McKenzie, Connolly
Played from the 80s : G.Marsh, Boon, Jones, S.Waugh, Rackermann, Lawson, Alderman, Reid, McDermott, M.Hughes
India
Gavaskar 1949 ( 66-87)
Vengsarkar 1956 (75-92)
Viswanath 1949 (67-88)
M.Amarnath 1950 (66-89)
Nawab of Pataudi 1941 (57-76)
Engineer (wk) 1938 (58-76)
Kirmani (wk) 1949 (67-94)
Kapil Dev 1959 (75-94) (Mainly 80s)
Venkataraghavan 1945 (63-85)
Bedi 1946 (61-81)
Prasanna 1940 (61-79)
Chandrasekhar 1945 (63-80)
Ghavri 1951 (70-85)
80s : Srikkanth, Sidhu, Azharrudin, Shastri, Prabhakar
Pakistan
Mudassar Nazar 1956 (71-93)
Majid Khan 1946 (61-85)
Zaheer Abbas 1947 (65-87)
Javed Miandad 1957 (73-94) (Mainly 80s)
Mushtaq Muhammed 1943 (56-80)
Asif Iqbal 1943 (59-82)
Wasim Raja 1952 (67-88)
Intikhab Alam 1941 (57-82)
Imran Khan 1952 (69-92)
Wasim Bari (wk) 1948 (64-84)
Sarfaraz Nawaz 1948 (67-85)
Pervez Sajjad 1942 (61-74)
Abdul Qadir 1955 (75-96) (Mianly 80s)
Iqbal Qasim 1953 (71-93)
60s : Hanif Mohammed
80s : Malik, Rameez Raja, Wasim Akram