Plus we don't know if 26 is his real age - another Ivory Coast-national Franck Kessié dropped the Milan medical because it proved he wasn't 20 years old (rumour has it).
Yup, there is a huge problem with African players lying about their age to gain an unfair advantage on the pitch. It's not just like this in just football either, it is a enormous problem throughout professional sports. African born NBA players are known to be one of the biggest culprits of this sort of deceit.