[languagemissions_f_aow]
@falagor, I can't give a localization key, but try using search in your text editor

Original text >> Just stay put, old man, don't move.
Russian >> Спокойно, парень, не двигайся.

парень a young man on russian

I believe these two options will good:
Спокойно, дед, не двигайся.
or
Спокойно, старик, не двигайся.