Noah, Abraham, Joseph, had to wait a long time before receiving the promised reward.
I would think there is a pretty big difference between waiting a long time and RECEIVING something promised and waiting a long time and finally dying without EVER RECEIVING what you were promised.
If you are a young person, you also need to face the fact that you will never grow old in this present system of things. Why not? Because all the evidence in fulfillment of Bible prophecy indicates that this corrupt system is due to end in a few years. Therefore, as a young person, you will never fulfill any career that this system offers. If you are in highschool and thinking about a college education, it means at least four, perhaps even six or eight more years to graduate into a specialized career. But where will this system of things be by that time? It will be well on the way toward its finish, if not actually gone!" Awake! 1969 May 22 p.15
Of course WT has purged that Awake from it's past and only people who may have somehow kept an original will be able to prove they made those promises.