"I've always believed in the adage that the secret of eternal youth is arrested development"

Alice Roosevelt Longworth's quote recommends that the key to staying young is to stay in a state of jailed advancement. This implies that one ought to not mature too rapidly and must instead remain in a state of innocence and naivety. This could be interpreted as a call to stay open-minded and to not let the severe truths of life harden one's heart. It could likewise be interpreted as a suggestion to remain curious and to never ever stop learning. By remaining in a state of jailed advancement, one can stay youthful and positive. This quote is a suggestion to stay young at heart and to never ever stop growing.