In terms of age, Yelena is chronologically 14 years older than Kate but biologically around 8. Yelena was in her 30th year during the snap, Kate was 16. This (7 years later) Yelena(losing 5 years) would still be 30, while Kate is 22.
Reminds me so much of 'civil war' "We're still friends, right?" "Depends on how hard you hit me." Just the fact that Yelena LET HER LIVE after getting slapped in the face... HA!