Is zakat obligatory on a sum of three thousand riyals that has been untouched for a complete year, knowing that the questioner does not know the exact number of years that have passed, and what is the amount of zakat due?

Saved money, for any purpose, is subject to Zakat (definition) if a full year has passed on it and it reaches the nisab (definition), which is approximately eighty-five grams of pure gold, or five hundred ninety-five grams of pure silver. The lesser of the two is considered the nisab. Zakat must be paid for each year separately. If the exact number of years is not known, one should act based on the predominant assumption, and the delayed Zakat for all years must be paid, even if the delay has been long.