I never followed Captain America too closely, but is Bucky frozen too? he looks mid-20s in that picture and it's the early 1940s, so modern day would be 20 + 70 = really old
btw, do Captain America and Bucky retain a pre-civil rights movement mentality? is there a comic where Bucky is appalled to see a colored man drink from the same water fountain?
bucky was thought to have been killed in the accident which froze captain america, and steve rogers (captain america's real name) spent a good decade in the comics whining about his guilt over it after he was revived
then, decades later, in what is termed a "retcon" in comics slang, readers found out that bucky hadn't died (although he'd lost an arm)
apparently the russians fished him out of the water, replaced his arm with a bionic one, and began using him as an "on-call" assassin throughout the years, placing him in cryonic sleep until needed (so he's aged very little)
eventually he was deprogrammed, and when captain america was killed in the comics for a while (nothing last forever in comics), he became the new captain america (wearing a slightly redesigned suit)
and, in my opinion, was a much more interesting character