Originally Posted by
dirtydozen
Do guys think it's too old/too much in bad shape and should be replaced ? If so, if you can recommand me one that could be great, I would like to get it for less than 100euros.
Replace it.
Any helmet, regardless of price, should have a certification from some sort of regulatory body. In the U.S. it will be a CPSC certification; since you mention Euros I assume there's an equivalent certification in whatever jurisdiction you're in.
The higher prices don't mean they're better from a safety certification standpoint, but usually mean that they're lighter/more aero/more stylish.
I express no opinion on MIPS helmets which is a safety feature that is a separate issue than official government certifications.