JMHO,
Without inspecting the tooth side of the belt for glazing or cracking ( actual cog contact surface ) …
Judging the belt condition only from the visible top area does not tell the whole story.
These areas in red look concerning:
Also you can clearly see the belt teeth shadowing ( yellow arrows ) which indicates the belt has enough time on it to allow the tension / follower to make these markings.
As to the condition of the engine’s internals:
I’d think the car has had regular oil changes during its life.