is i thoght as though i had aged 5 years a metaphor?
It seemed as if I had aged 5 years.
No, these aren't metaphors, since they are statements of fact.
"I aged 5 years overnight!" This is metaphorical because it is not literal. You are asserting something to be true, which in reality is not.
For a metaphor, it's not enough to say that A feels like B. It must read A is B.