The end of the ages, or end of time is Greek concept; it is not Jewish origin. Jews believe in Time to Come, or arrival of the Messiah King and the start of Messianic age. There is no violent end of the world. The belief of humanity divided into ages and its violent age, is Greco-Roman. Greeks believed in golden, silver age, and these invented lost past times where in their mind destroyed by clashes between gods, which eventually destroyed the Earth. This belief was known to early Christians who transformed the idea of lost golden era of humanity into their Christian theology, and they believed that the violent end at the hands of Christian god will user another golden, righteous era for humanity. I am not sure who was the original proponent of this idea outside John of Patmos, but the idea of end of times and end of age is well resonated in the writing of St. Augustine in his monumental work City of God.
Since late antiquity, Christianity was obsessed with the idea of end of age and end of time, until Catholic church forbade it as heretical teaching. The crackdown against doomsday beliefs started already during Schism in the 14th century, and was finally considered as heresy by the time of Reformation. However, the torch of the doomsday scenario was transferred to Protestantism which produced numerous doomsday cults in Anglo-Saxon world including JWs.
If anyone studies the end of time hysteria and hypes since the Roman Empire to the end of the Middle Ages, there was a strong belief that the End is here and new Golden age of humanity will arrive shortly. When Alaric sacked Rome in 410 hundreds of thousands Christians saw it as a sign of the End. Similar mass hysteria happened in 1000AD or 1419. At the end, the end of age and end of time means nothing. Catholic church knew it already 500 years ago.