Hello please can you help me?

On my WhatsApp I can message a contact, The same contact can message me back. I can see his Photo,  His status which states hey I'm using WhatsApp. We can send one another pictures and messages. Messages are delivered both ways with the grey then blue ticks however I cannot see his last online time.  He can see mine. 

My friend also has him as a contact and they can see his last online time. 

I have search the Internet to find an answer for this but to no avail, I'm  left bewildered and frustrated. 

Please help