Well not us we will be dead and forgotten but anyway they have used all the hydrogen in their core and the main area of hydrogen fusion is actually a shell around the core which has collapsed allowing the atmosphere of the sun to expand This collapsed core is helium and fusion proceeds as it would normally i believe carbon is produced If you think about it all the atoms in your body were once part of a star Unless of course you are a creationalist then your atoms which can be produced no other way than in the core of a star were dumper here in very specific quantities by a "creator"