I assume he is not Asian, otherwise you would not be posting about this
Is he worried or anxiously anticipating more hair growth? As his mother, his self-esteem would be my biggest concern. I do not think there will be much more capillary development at his age.
Being partly Asian and having married an Asian, I am around a lot of smooth-faced young men of both families. For us it's normal - I confess that a lot of body hair on men, as seen sometimes at the pool, for example, seems repulsive to me.
So the bottom line is there are plenty of people in the world and in this area who do think this is perfectly fine!