
Wager is best known for portraying the role of the young "Pip" in David Lean's 1946 film of Great Expectations.
Wager was born in Willesden, London and grew up in Mill Hill, Hendon. Wager’s father was a plumber and decorator. He studied at Christ's College. In 1945, Wager auditioned call for the role of ’Pip’ in the film Great Expectations. Wager won the role and was praised by critics for his performance. He won a Film Daily Critics Award for Best Performance For a Juvenile for his role in the film.
After appearing in Great Expectations, Wager continued working in films and television in England. In the late 1950s, Wager moved to Sydney, Australia where he continued his career in both film and television but occasionally returned to England for acting jobs. He made his final onscreen appearance in the 1988 Australian television movie The Boardroom.

Great Expectations
1946 · as Young Pip

Scrooge
1951 · as Fezziwig's Lad (uncredited)

The Battle of the River Plate
1956 · as Lookout, HMS Ajax

...and millions will die!
1973 · as Inspector Bigelow

Deadline
1982 · as Bomb Expert

The Night Caller
1965 · as Pvt. Higgins

Above Us the Waves
1955 · as George

The League of Gentlemen
1960 · as Army Switchboard Operator (uncredited)

The Hi-Jackers
1963

Night of the Prowler
1962 · as Det. Sgt. Baker

The Captain's Table
1959 · as Tony Millington (uncredited)

Fame Is the Spur
1947 · as The Boy Hamer

The Guinea Pig
1948 · as Bert

Hungry Hill
1947 · as Young Wild Johnnie

The First Christmas
1979

The Secret Tunnel
1948 · as Roger Henderson

The Wind Cannot Read
1958 · as Moss

No Place for Jennifer
1950 · as Ted