Cryogenic stasis

this was a method employed on very early deep space flights to counter act the aging process the Sleeper Ship Botany Bay employed this method TOS Space Seed Cryostasis was rendered a thing of the past by advances in Sublight Propulsion in 2018

other uses
in 1994 a company wiched used Cryostasis was launched the idea was tha deceased people could be paced in an orbiting cryogenic satellite the Starship Enterprise D under the command of Jean Luc Picard in 2364 TNG The Neutral Zone