I filled out your Healthy Body Calculator and I was wondering how much of a difference there is, me being 16 not 18.( I’m 5′ 11″, 140 pounds). Thank You.
Not a lot. You can weigh 155 – 189 pounds. Needless to say, you are probably tall and thin for your age. But the good news is guys don’t reach 90% of their adult height until age 18. So you will probably grow taller yet. Most guys don’t increase muscle mass until their vertical height growth slows so don’t expect to fill out till after 18.