Do what you want to do.
The so called rules that are out there serve no purpose but to cause grief. If your hair is still growing and you haven't reached your goal length then let it grow. No one controls your hair but you.
I'm a 29 year old man. My hair is down to my hips and I plan to never let it be shorter again.
I also participate at many long hair care sites.
But I also like it here at Lynne's site. She's a nice helpful lady.