What money did they use 100 years ago Pence or Dollars?

You do not specify who "they" is.

With few exceptions, Britain and most of the British Empire/Commonwealth countries, British Dependencies and British Overseas Territories would have been using Pounds, Shillings and Pence or something similar 100 years ago.

The second half of the 20th Century saw most countries change from change from the archaic currencies they had been using to a more user friendly "decimal" currency, often based on the Dollar of 100 cents or, in the case of Britain, to the Pound of 100 Pence.