Amazing series overall. It's very entertaining and fun to read, but I definitely wouldn't recommend the later books to anyone below 13, or maybe even a bit older as the series goes on, but any mature person around that age could probably manage it fine. I really like the characters compared to other teenage protagonist novels, as most books portray teenagers to be much more innocent than they actually are, however I found CHERUB much more relatable (apart from the drugs and sex stuff). I would recommend it to pretty much anyone within the appropriate age range, being teens to adults.