Arman Hessabi is 25 years old. While it sounds like he should be at the physical peak of his life (kind of crucial for playing Premier League football) he could be too young, mentally.
A lady I used to play pick-up soccer with told me that, intellectually (as in seeing everything on the field), players mature right around 32. This makes sense to me, as it would be after 20 years of playing serious soccer.