You're obviously wrong. You're not taking into account what Jesus said about how the end of the age would be identified.
Luke 20:34 Jesus replied, “The people of this age marry and are given in marriage. 35 But those who are considered worthy of taking part in the age to come and in the resurrection from the dead will neither marry nor be given in marriage, 36 and they can no longer die; for they are like the angels. They are God’s children, since they are children of the resurrection.
You say "the end of the age is obviously the end of the OT practices" and, yet, that is not how Jesus said the end of the age would be identified. Why do you seemingly ignore other things He said about the end of the age and about this age and the age to come? Based on what Jesus said in Luke 20:34-36 the end of the age would occur when the resurrection of the dead occurs and it will be marked by no more marriage and no more death. That has clearly not yet occurred. Please address this.
Also, the following makes it clear that the judgment of all people will occur at the end of the age.
Matthew 13:47 “Once again, the kingdom of heaven is like a net that was let down into the lake and caught all kinds of fish. 48 When it was full, the fishermen pulled it up on the shore. Then they sat down and collected the good fish in baskets, but threw the bad away. 49 This is how it will be at the end of the age. The angels will come and separate the wicked from the righteous 50 and throw them into the blazing furnace, where there will be weeping and gnashing of teeth.
What Jesus said has not yet occurred because the day of judgment has not yet occurred, so that means the end of the age has not yet occurred. Please address this. You should not interpret what Jesus said in the Olivet Discourse about the end of the age without taking everything else He said about the end of the age into account.