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have a senior/blond etc. moment

to behave for a short time as though you are old/silly etc. I posted the letters without putting stamps on them - I must have been having a senior moment.
See also: have, moment, senior

senior moment

n. a lapse of memory in an older person. I had a senior moment and forgot your name. Sorry.
See also: moment, senior
References in classic literature ?
Two months passed, and the Senior Subaltern still educated The Worm, who began to move about a little more as the hot weather came on.
The gentlemen he spoke of were the other senior partners of the firm; for, as was always the case with legal associations of old standing in New York, all the partners named on the office letter-head were long since dead; and Mr.
It did not generally carry a doctor, but one of the senior surgeons at the hospital knew a director of the line, and Abraham was taken as a favour.
He was in the first form, within two or three places of the top, and after Christmas when several boys would be leaving for the senior school he would be head boy.
There's that Senior who is so devoted to you -- Will Leslie.
It will be a cheap lesson if it teaches you to take nothing upon trust in business, and to insist upon knowing exactly what your partner is doing, however senior he may be to you.
The senior partner--the tried friend and adviser of our family--received me.
One Sunday morning in June, 1879, about two weeks after what has been related, May senior left the house immediately after breakfast, taking a spade.
So he remained while the senior monks filed slowly and sedately into the chamber seating themselves upon the long oaken benches which lined the wall on either side.
I borrowed the money and paid to enter the senior class of a "cramming joint" or academy.
John Alvarez, my first officer, is twenty years my senior.
He laughed, and answered, 'I shall present the doctor as my senior partner; my senior partner will be the very man to advise her.
Frederick Augustus Bullock, of the firm of Hulker, Bullock & Bullock; but hers was a most respectable attachment, and she would have taken Bullock Senior just the same, her mind being fixed--as that of a well-bred young woman should be--upon a house in Park Lane, a country house at Wimbledon, a handsome chariot, and two prodigious tall horses and footmen, and a fourth of the annual profits of the eminent firm of Hulker & Bullock, all of which advantages were represented in the person of Frederick Augustus.
Ablewhite, senior, himself) for a loan of three hundred pounds.
He's the very man," declared the senior, without a moment's hesitation.