Forty Years Of Academic Public Psychiatry

Could you please explain this rule to me? Does it mean that numbers thirty-one, forty-five seventy-seven ninety-nine, etc are written with a hyphen but thirty, forty, fifty, sixty, seventy, eighty, …. Insights reveal, No, forty-five hundred = four thousand five hundred = 4,500 "Forty-five hundred" is the most common way of expressing this in speech. Observations indicate, I was curious to know how the difference in spelling between four, fourteen and forty came about. Additionally, How would you idiomatically say "the wrong side of forty"? It's a humorous way of saying you're over 40 without giving away your real age. These findings regarding Forty Years Of Academic Public Psychiatry provide comprehensive context for understanding this subject.