Emotionless child ? Possibly

Was having a rummage through old posts and found one about films and which was the first film that made you cry. 
I can remember the land before time, bambi and the lion king 
But my son who is turning 8 next week has never cried over a film or even seemed like it affected him. 
He's more likely to look at me and see me crying and ask if I'm ok and get me a tissue than have a bubble himself. 
Do your kids get emotional? 
Is there anything wrong with him not having these emotions? 
Not that I want my kid sitting crying but there are tear jerker moments and he doesn't react to them