Demographic projections 90 years into the future? Yep, I don't see how they could be wrong in any way . . .
Anything beyond about 10 years is pure speculation, even predictions within that period are often wrong. There's an almost incalculable number of factors that go into demographic and population changes. It's like trying to predict the weather a year in advance - error accumulates exponentially on a vast scale very rapidly as things that you cannot predict, chance occurrences, occur on individual, national, regional and global levels to affect demographics every day. Try multiplying that increasing error every day together over 90 years, and you have a useless statistic.