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The Disciples asked for a sign:
Jesus said that earthquakes famines pestilences and wars were NOT a sign that the End was about to come."
The Disciples asked for a sign about the end of the age.
You have to ask youself, what age were they living in at that time?
70AD marked the end of the Old Covenant age.
Hebrews 8:13 13 "By calling this covenant “new,” he has made the first one obsolete; and what is obsolete and outdated will soon disappear."
If the old covenant "will soon disappear" that means it's still in place as of the writing of Hebrews.
Jesus said that some of the people there with his at the time would still be alive when the end comes.
And some of the people that were with Jesus at that time were still alive in 70AD.
So there you go.
Peace