Weird thing about Hiro and child Hiro

When Hiro traveled back in time with Kaito to Hiros mothers furneral, Hiro met his young self. The thing I don´t understand is, when young Hiro met the present Hiro, shouldn´t the young Hiro when he grew up realize that it was himself he had been talking to that day? And if present Hiro had changed the past by meeting his young self wouldn´t it have changed something in the present?

I doubt it - they barely spoke much, and he was young at the time, so I doubt his memory would recall something as a man he met at his mothers funeral, when the day itself was a lot more important

That´s true, but before they traveled he said he remebered the day real good, but I guess that because of the furneral, not a man.

He most likely assumed that future-him was just another mourner at the funeral

Although past him really should start paying attention, because everyone can see the thing with the glasses

Or maybe it was the secret reason he suspected he had TSM all along

HE ALREADY KNEW