Response to @texaslibertarian: "but bucky has been awake mostly since 1945 to present timeline and hasn't aged a bit."
"James Buchanan Barnes was born in 1917, and was captured by HYDRA in early 1945. He survived his fall from the train after having received HYDRA's experimental supersoldier serum, and was eventually brainwashed into serving as their assassin. He was also kept in cryogenic preservation, but his history is much more shrouded: we know that he encountered Isaiah Bradley in 1951, assassinated John Kennedy in 1963, murdered Howard and Maria Stark in 1991, and shot Natasha Romanoff in 2009. He spent a total of 69 years under HYDRA control before escaping in 2014, so if we guesstimate that he spent about of that time in cryogenic preservation, then by the time that Steve passed the shield to Sam in 2023, Bucky would have been chronologically 106 years, about 72 years of which he would have spent unfrozen."