“The secret of eternal youth is arrested development”

“The secret of eternal youth is arrested development” was said several times by Alice Roosevelt Longworth (1884-1980), the only daughter of Theodore Roosevelt, the 26th President of the United States. She made the quip in 1968, when she was 84 years old. In 1975, Longworth added:
 
“I can’t remember just who said that, but it’s so horribly true. I’m just pottering and tottering around.”
 
   
Wikiquote: Alice Roosevelt Longworth
Alice Roosevelt Longworth (12 February 1884 – 20 February 1980) was the only daughter of Theodore Roosevelt, the 26th President of the United States, and his first wife, Alice Hathaway Lee.
 
Sourced
I’ve always believed in the adage that the secret of eternal youth is arrested development.
. As quoted in Alice, The Life and Times of Alice Roosevelt Longworth (1979) by Howard Teichmann, p. 237
         
Google Books
Washington Education
Volume 80
1968
Pg. 144:
“I am just an ancient relic,” pronounced Alice Roosevelt Longworth on her recent 84th birthday, then demolished her own statement by explaining why she hasn’t worn down yet: “The secret of eternal youth is arrested development.”
 
Google Books
Newsweek
1974  
Pg. 59:
On one occasion, Alice Roosevelt Longworth remarked that “the secret of eternal youth is arrested development.” But at 90, her secret seems to be eternal development and arrested youth.
 
28 February 1975, Ironwood (MI) Daily Globe, “Potomac Jottings” by Mary Tuthill (Booth News Service), pg. 9, col. 8:
Socialite Alice Roosevelt Longworth, who shares her Feb. 12 birthday with Abraham Lincoln, was 91 years old this month.
 
She poured tea for her guest, answered her own telephone calls and had this to say about getting older:
 
“After all, the secret of perpetual youth is merely arrested development.”
 
“I can’t remember just who said that,” she added, “but it’s so horribly true. I’m just pottering and tottering around.”
 
Google Books
Mrs. L:
Conversations with Alice Roosevelt Longworth
By Alice Roosevelt Longworth and Michael Teague
Garden City, NY: Doubleday
1981  
Pg. 199:
I’ve always believed in the adage that the secret of eternal youth is arrested development.
 
Google Books
Alice:
Alice Roosevelt Longworth, from White House Princess to Washington Power Broker
By Stacy A. Cordery
New York, NY: Penguin Books
2007
Pg. ?:
She said frequently that “the secret of eternal youth is arrested development.”
 
Google Books
The 2,548 Wittiest Things Anybody Ever Said
Edited by Robert Byrne
New York, NY: Touchstone (Simon & Schuster)
2012
Pg. ?:
569
The secret of eternal youth is arrested development. —Alice Roosevelt Longworth (1884–1980)
 
Zero Hedge
KuNG Hei: GaME BoY/FaT BoY…FaT CHoi!
Submitted by williambanzai7 on 01/22/2012 16:14 -0400
(...)
“The secret to perpetual youth is arrested development.”—Alfred North Whitehead
(This is probably a mistake because “Alfred” comes before “Alice” and both have youth quotes.—ed.)