Affiliate Marketing Secrets

Hey Everyone, would really apreciate it if someone would be able to answer these questions for me, i have written my dilema and i would really like to find out ASAP what i can do about it.
So, I’m nearly 16, (in December) and am planning to register me and my pony BSJA.
My pony is 147.2cm (just over 14.2) she has previously competed to British Novice Level previously before i brought her.
She has £138 notional & £46 actual winnings.
My dilema is that i am going to be 16 soon and as my pony is 147.2cm does that mean she is classed as a ‘junior’? Because that would mean i couldn’t compete on her in affliated classes because i’d be a ‘senior’?
Honest and genuine answers only please. Much apreciated! Thanks in advance and i hope someone can help me get my head around this, (also any additional information regarding BSJA or affiliated show-jumping would be fab as i am really quite new to this)
🙂