Islam is one of the world’s major religions, with over 1.8 billion followers globally. It is based on the teachings of the Prophet Muhammad, who is believed by Muslims to be the last and final prophet in a long line of prophets sent by God to guide humanity. The Islamic calendar, also known as the Hijri calendar, is based on the lunar year and is currently in the year 1444 AH (after Hijra). In this answer, we will explore the origins of Islam and how old it is in years.

Origins of Islam
Islam originated in the Arabian Peninsula in the 7th century CE. At that time, the Arabian Peninsula was inhabited by various tribes, many of whom were polytheistic and worshipped idols. According to Islamic tradition, the Prophet Muhammad was born in the city of Mecca in 570 CE. He began receiving revelations from God at the age of 40, and these revelations continued for the next 23 years until his death in 632 CE.
The revelations that Muhammad received were later compiled into the holy book of Islam, the Quran. The Quran is believed by Muslims to be the literal word of God, revealed to Muhammad through the Angel Gabriel. In addition to the Quran, Muslims also follow the teachings and practices of the Prophet Muhammad, which were recorded in a collection of sayings and actions known as the Hadith.
Spread of Islam
After the death of the Prophet Muhammad, Islam began to spread rapidly throughout the Arabian Peninsula and beyond. The first caliph, or successor to the Prophet Muhammad, was Abu Bakr, who ruled from 632 to 634 CE. During his reign, he successfully united the Arabian Peninsula under Islamic rule and launched a series of military campaigns against neighboring empires, including the Byzantine Empire and the Sassanid Empire.
Under the leadership of the second caliph, Umar, Islam continued to expand rapidly. Umar ruled from 634 to 644 CE and oversaw the conquest of Syria, Egypt, and Persia. The expansion of Islam continued under subsequent caliphs, and by the 8th century CE, the Islamic Empire had become one of the largest empires in world history, stretching from Spain in the west to India in the east.
How old is Islam in years?
Based on the traditional Islamic calendar, which is based on the lunar year, Islam is approximately 1444 years old as of 2023 CE. The Islamic calendar begins with the Hijra, or migration, of the Prophet Muhammad and his followers from Mecca to Medina in 622 CE. This event marks the beginning of the Islamic era and is considered one of the most significant events in Islamic history.
The Islamic calendar consists of 12 lunar months, which are approximately 29.5 days long. This means that the Islamic year is about 11 days shorter than the solar year. As a result, the Islamic calendar gradually drifts out of sync with the Gregorian calendar, which is based on the solar year. Currently, the Islamic year is approximately 10-11 days shorter than the Gregorian year.
It is worth noting that the exact date of the birth of Islam is a matter of some debate among scholars. While most scholars agree that Islam originated in the 7th century CE, there is some disagreement about the exact year that the Prophet Muhammad began receiving revelations from God. Some scholars argue that the first revelations may have occurred several years earlier than traditionally believed, while others argue that they may have occurred later.
In conclusion, Islam is one of the world’s oldest and most significant religions, with a history that dates back over 14 centuries. It originated in the Arabian Peninsula in the 7th century CE and has since spread throughout the world, with over 1.8 billion followers today.