Application to bring my son to the UK

Hi Guys,

I am just wandering if you could help me with an immigration advice on what’s best option ( application) to bring my son to UK.

I live in Glasgow, Scotland in the UK and I am originally from Nigeria and British as well. I have a son in Nigeria who is 16 years old and he will be 17 in September 2023.

My immigration history is as follows :
Entered Uk-2005( with a visiting visa)
Married-2010.
Discretionary leave to remain-2010 ( 3 years)
Discretionary leave to remain -2013 ( 3 years)
Indefinite leave to remain-2016
British Nationality-2022.

I was asked in the application for naturalisation in the additional child information section if I had a child whose birth parent was not my partner and I answered YES. They further asked if the child lives with me which I answered NO.
Presently my son lives with my aged parent in Nigeria and I thought it would be in his best interest to join his two brothers here and the rest of the family .

My questions are as follows: what particular application should I file for him and will his age impact the application positively or negatively.

Thanks Guys

Where is the other parent?