I believe that we are truly living in the end times and have been for the past 2,000 yrs or so. However I believe that the return of Christ could be in my lifetime. But i would NEVER say I knew for sure as Jesus himself said only the Father in heaven knows of that day and hour.
1 Corinthians 15:51-54 (NKJV)
Behold, I tell you a mystery: We shall not all sleep, but we shall all be changed- In a moment, in the twinkling of an eye; at the last trumpet. For the trumpet will sound, and the dead will be raised Incorruptible, and we shall be changed. For this corruptible must put on incorruption, and this mortal must put immortality. So when this mortal has put on immortality, then shall be brought to pass the saying that is written:"Death is swallowed up in victory."
1 Thessolonians 4:16-17 (NKJV)
For the Lord himself will descend from heaven with a shout, with the voice of an archangel, and with the trumpet of God. And the dead in Christ will rise first. Then we who are alive and remain shall be caught up together with them in the clouds to meet the Lord in the air. And thus we shall always be with the Lord. Therefore comfort one another with these words..