Will Russia's Su-57 PAK-FA Stealth Fighter also be Moscow's Sixth Generation Warplane?

There is very little basis to support the conclusion that the current Su-57 airframe would still be relevant in three decades time.Will Russia's Su-57 PAK-FA Stealth Fighter also be Moscow's Sixth Generation Warplane?A senior Russian official has suggested that the Sukhoi Su-57 PAK-FA could be upgraded to become a “6th generation” fighter.  However, it is not clear what a “6th generation” fighter would mean in the Russian context.