Wow that's a loaded question. How much time you got lol? I'll try to be brief.
Yes I believe both they were, and that we are, living in the last days. I believe the last days span the 2000 years since Christ has been in heaven. The last days of man's week.
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It appears Yah has been following creation week
to the very millennium based on 2 Peter 3:8 and Psalm 90:4 (I posted a few details here:
https://christianchat.com/threads/what-is-the-meaning-of-hebrews-4.166450/post-3691334), continuing through to the Messiah's first appearance in the 4th millennium, fulfilling the Sun's appearance on the 4th day of creation. Christ is the "Sun of Righteousness" (Malachi 4:2). {I can provide historic proof he was born in the 4th millennium if you like, but skipped it for brevity.}
Building on the pattern, the themes of the 5th and 6th days of creation week are: beasts of the
Sea and beasts of the
Earth (respectively) that were created after the 4th day. And interestingly enough Revelation 13 prophesies beasts rising from the same areas: one from the
Sea and another from the
Earth. What are the odds? These two events are then followed by a reign of Christ that just so happens to span a millennium of all lengths of time.
So if we follow the pattern laid out for creation week - to the very millennium - then the last (nearly) 2000 years since Christ ascended were days 5 and 6 of
the last days of man's week...and the pending millennium reign of Christ will be day 7; the Lord's day of rest ("The Day of the Lord"; The Sabbath).
This means the NT writers were indeed living in the last days, suffering through the appearance/reign of the beast of the
sea in the 5th millennium (
roughly 1-1000 CE, give or take several years; the little horn of the beast of the
sea changed our measurement of time [Daniel 7:25] so it's hard to be exact). It then follows that we were personally born at the tail end of the 6th millennium (
roughly 1001-2000 CE) and currently live during the time when both the beast of the
sea and beast of the
earth exist, with the beast of the
earth currently reigning over the world as Revelation 13 said it would.
At present, we're currently waiting for the harvest by Christ when he will gather true Israel (both natural and wild branches) scattered around the world and bring them into the kingdom (the same event detailed in Daniel 7:13-14, 18, 27 = Matthew 24:28-30 = Luke 21:25-27 = Revelation 14:14 = Ezekiel 36:21-25 = Jeremiah 30:8-11 and more).
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I tried to be a brief as possible so I didn't reference historic events for the 5th and 6th millennia. But I'm happy to share how they were/are being fulfilled in more detail if you want.