Originally Posted by Whiskey Tango
In May 2011 the Dep. of Veteran's Affairs estimated there were still 2,079,000 WWII vets out of 16,112,566 total US service members still alive. Further, they project that there will be 855,000 still alive in Sep. 2015 and 112,000 in 2023. (estimates midway down second page
So it's easily within the realm of believability that Peggy could still be alive.
Most of those vets were likely late teens or early twenties at the end of WW2 in 1945. Peggy was an officer level ee in advanced science unit of the military which would make her at least 30, not to mention the war wasn't even over yet when Cap went down in the North Atlantic. (1942)
Although even if I just use your numbers for basis of comparison, that's only 12.5% of the vets still alive, which means there's almost an 88% chance that Peggy has left this mortal plain.