Okay... if they were worth their salt as guardsmen, they really should be wondering about the sword. Maybe they wouldn't understand what it is... but they would see something special about it.
@qkazamakj Probably gets revealed in the next chapter, but his true age is around 40, including time in the rift.
but because of the unique ability he stole from the demons he stole their lifespan, magic, etc. which made him surive that long, it also revitalized him and now he looks younger, he probably also has a huge lifespan because of it
Well firstly, they wouldn't have any idea on how long he would be alive.
Secondly, it was a rift and he was the mage, so they wouldn't have the knowledge or skills to enter.
@Boomburst well it is a fantasy where adventurers are common. so carrying weapons is not uncommon and they prob think its just a heirloom or a departure gift from his parents or somthing along those lines