How buff should a sixteen year old be?

At sixteen, individuals are still going through significant physical and hormonal changes, so there isn't a specific standard for how "buff" they should be. Focus should be on developing healthy habits, such as regular exercise, balanced nutrition, and building strength appropriate for their body type and fitness level. It's important to prioritize overall health and well-being rather than aiming for a particular physique. Each person's growth and development will vary, so what matters most is feeling strong and confident in one's own body.