Sesquicentennial

I need not have worried about being naked; no one seemed to notice . . . which irked me. Gentlemen should at least leer. And a wolf whistle or other applause would not be out of place. Anything less makes a woman feel unsure of herself.    (Perhaps I am too sensitive. But since my sesquicentennial I have been disposed to check the mirror each morning, wondering.) [1, p. 5]

Sesqui is a prefix meaning "one and a half", and centennial of course refers to a period of 100 years. So putting the two together, you can one and a half of 100 years, which equals a period of 150 years. Ah Maureen, mother of Lazarus, long have thee lived? Still quite young even at 150 years. To Sail Beyond the Sunset is part of a series of books by Heinlein detailing his alternate universe in which there is a group of people known at the Howard families that intermarry in order to produce children who live for a very long time. My two favorites in this series are Time Enough for Love and Methusela's Children, both starring Lazarus Long, Maureen Johnson's most famous son.