Thank you for your feedback!Huh! I'm not sure why but that surprised me. I wonder what age range those fifth adults are in? Seniors, maybe? I didn't see that mentioned in the article, although it showed a really nice increase in users overall.
"The institute conducted a representative survey by asking 2,106 adults (aged 16+) from both urban and rural areas of Russia."
I think your assumption about seniors (from rural areas in particular) sounds like actual reality.