It is not legal. If the 16 year old engages in any sexual conduct, they could face statutory rape charges and the parental consent assuming there was any would have no bearing on that.

Whats the youngest a 15 year old can date?

There is a so-called rule about dating: the youngest age you are supposed to date is half your age plus seven. So, if youre 16, the youngest age you should consider is 15 – because 16 divided by two is eight and 8+7 equals 15. We can write the dating rule as an equation: y = x ÷ 2 + 7 .