Zaid Alsalami, Shaykh Dr Zaid Alsalami is an Iraqi born scholar, raised in Australia. He obtained a BA from Al-Mustafa University, Qom, and an MA from the Islamic College in London. He also obtained a PhD from... Answered 2 months ago

Bismihi ta'ala

Assuming you would have naturally experienced one of the signs of ritual maturity, or bulugh, you become mukallaf. For a boy, these signs are:

1. Having a wetdream.
2. Growth of coarse pubic hair in private parts.
3. Reach age of 15 full lunar years.

As a result, it would be wajib for you to pray, and so if you know you did not pray for about two months, you are able to perform them as qadha`. 

And Allah knows best.