He was one of those miserable men of about twenty-eight, which is a very bad age to be in authority, too old to be generous and too young to be wise.-- Peter Walker, The Courier's Tale
At twenty-nine, Hamilton had passed into that border country where middle age is still remote, but where failure (for the ambitious) can scarcely be afforded.-- Christopher Koch, The Year of Living Dangerously
If these people are right, it might be better to go straight from 27 to 30, like those buildings in New York that have no thirteenth floor.
Not that this is of the slightest relevance to me. Besides, I remember 28 and 29 as pretty good. A tad desperada, but pretty good.