John Gresham Machen was a professor at Princeton Seminary in the early 1900s, and was founder of Westminster Theological Seminary in Philadelphia. He is best known as a defender of Christian orthodoxy in the face of rising theological liberalism in the churches of his day. Perhaps his most famous book was Christianity and Liberalism, in which he made the case that theological liberalism, with its de-emphasis on human sin and denials of the power of God, is not just a different form of Christianity, but is actually a rival of Christianity.
And he was another fundamentalist who had no problem with an old Earth. Here’s a quote from Machen’s The Christian View of Man:
The meaning of “day” in Gen 1 has been debated in the church at least since the days of Augustine. The literary form of the passage in its relation to other scriptures is important for its interpretation. Responsible Reformed theologians have differed as to whether Gen 1 teaches a young earth or allows for an old earth. While one of these interpretations must be mistaken, we believe that either position can be held by faithful Reformed people.
Grace and Peace
Quote from Todd S. Bordow: The Debate Over The Days of Creation