It is a law of Allah SWT that whenever misguidance spreads and ignorance becomes rampant; whenever the weak are oppressed and people get stuck in the mire of Kufr and Shirk, then to guide the people to the straight path and to adorn the world with justice, Allah SWT sends His Prophets.This has happened in every age.These divine personages kept delivering the message of Allah SWT to His people until the our Master, the leader of all Prophets, Hadhrat Muhammad (Sallallahu alaihi wa sallam) graced the world with His presence.There will not be any prophet after Him. He (Sallallahu alaihi wa sallam) declared His Prophethood at the age of 40 years of age, although has been a Prophet when Prophet Adam (Peace be upon him) was in the throes of creation, as given in this Hadith of
(Jame’ Tirmidhi, Vol 2, Pg No: 202)
Translation: Hadhrat Abu Hurairah (May Allah be well pleased with him) entreated: O Prophet of Allah! When did Prophethood (Nubuwwah) become Wajib for you? The Holy Prophet (Sallallahu alaihi wa sallam) replied: I was a Prophet even when Adam (Peace be upon him) was between soul and body.”