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.
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'Quid' is a slang term for one pound sterling (£). There are 100 pence in a pound.
British: 100 pence = 1 pound European: 100 cents = 1 euro
No. Pence is the plural of Penny and is the basic unit of the British currency. There are 100 Pence to the Pound Sterling (GBP). Cents are a 100th of a Dollar, as used by many countries around the world.
Decimal currency was officially introduced in Britain on "Decimal Day" the 15th of February, 1971, with the Half New Penny, 1 New Penny and 2 New Pence coins being issued. The 5 and 10 New Pence coins had been introduced much earlier in April, 1968, and the 50 New Pence coins were introduced in October, 1969. The new currency consisting of 100 Pence to the Pound replaced the old currency of Pounds, Shillings and Pence. 12 Pence to the Shilling, and 20 Shillings to the Pound.
A century = 100 years