Are the guys in that picture exceptionally short (young) or are their rifles exceptionally long?
Both, I think. I'm guessing the kids- young men in responsibility if kids in years- to be about 14 years old. Their Vintovka Mosina rifles are likely the early 3-line rifle, Model 1891, with a longer [800mm barrel than the more usually encountered M91 and M91-30 Mosin-Nagant rifles of the WWII period. 1,306 meters overall, 1,738 meters with bayonet.