Which position in the Russian presidential referendum 1991 had the lowest age of candidacy?
select ?ent where { ?ent wdt:P31 wd:Q4164871 . ?ent wdt:P2998 ?obj . ?ent wdt:P92 wd:Q4127536. } ORDER BY ASC(?obj)LIMIT 5 
position: Q4164871 russian presidential referendum, 1991: Q4127536