Board Thread:Naruto Discussions/@comment-26320638-20150422140407/@comment-6769189-20150423142214

Actually the fact that they didn't show up heavily implies that they weren't there. if they were there at the beginning of the conversation it still doesn't necessarily mean that is the reason Hagoromo showed up. that is speculation on your part.

Naruto was also alive because Sakura was manually beating his heart, giving him the 9 tails would help him self sustain his life.

EDIT: When Hagoromo started speaking with Naruto he said he wasn't dead *yet*, meaning that Naruto didn't have the remaining beasts to keep him alive.