What Occulus said, it's not just temple recession characteristic of NW2, his forelock has also become more narrow as the edges have eroded away. From what little I can see if the sides I think the temple points may have taken a hit too. Density looks good though, which is a blessing! This is an NW2/3. More than 2, less than 3, which for 23 years old is definitely not good. finasteride, minoxidil immediately. Mature hairlines don't just happen in 30s and 40s though. It's very common in 20 somethings and teens and may well stay stable for decades.