From Sahih Muslim (Hadith 7412):
Anas reported:A young boy of Mughira b. Shu'ba happened to pass by (the Holy Prophet) and he was of my age. Thereupon Allah's Apostle (ﷺ) said: If he lives long he would not grow very old till the Last Hour would come (to the old people of this generation)
Reference: Muslim 7412