The Book of Occultation — al-Ṭūsī · Hadith 660 (#Ḥadīth #2)

396- نحو ما روي عن أبي جعفر عليه السلام أنه قال: ليس صاحب هذا الامر(من جاز من أربعين)، صاحب هذا الامر القوي المشمر. وما أشبه ذلك من الاخبار التي وردت مختلفة الالفاظ متباينة المعاني.

H 396 - It is narrated from Imam Muhammad Baqir that the age of Imam Mahdi would not be more than forty years. He would be extremely strong, powerful and energetic. There are numerous traditional reports resembling this one, which differ in words as well as meaning.

Gradings are classical jarḥ-wa-taʿdīl, name-matched to a rijāl index (not individually re-verified).