frako writes:
Mark 9:1
King James Version
1. And he said unto them, Verily I say unto you, That there be some of them that stand here, which shall not taste of death, till they have seen the kingdom of God come with power.
For the Mark 9:1 quote, I think a reasonable interpretation is that Jesus was referring to the Transfiguration described in 9:2-7.
In other words, Peter, John, and James got a sneak peek while they were still alive. For more than the sneak peak, including the other predictions, no time frame is given.
A similar argument can be made for Matthew 16:28 and possibly even Luke 9:27. I think only those who are spoiling for a fight would have much of a problem with these verses.
IMO, Matthew 24:27-34 is a much more problematic scripture.