There's always going to be alot of talk in the forums on whether or not you are a suitable candidate for stepping into the land of Juice.

Besides obvious age barriers due to you still naturally growing, training to your natural limit potentially from a genetics standpoint i think another important point to consider is gym experience. So saying that where do you fit in?

Beginner

Less than two years in the gym.
Strength is poor. Can't bench press or squat their own bodyweight.
Not coordinated enough to do heavy compound movements well. Require plenty of hands on guidance.
Often can't feel target muscles working.
Can't understand most cues such as "tuck your elbows in" or "lift your sternum up."
Physiques can vary considerably, but usually will show very little muscle belly fullness or roundness, vascularity, or striations. Might even be skinny fat.

Intermediate

Usually two years plus in the gym.
Decent at executing the basic heavy compound movements.
Can feel most muscles working well.
Understands most verbal exercise cues.
Strength is decent. Can likely do a few reps with bodyweight on bench presses (or within 30 pounds of bodyweight for females), and their weight plus 100 pounds in the squat with good form for a few reps (or bodyweight plus 25 pounds for females).
Physiques show signs of good development, usually described as "athletic." They might have some muscle groups that are lean with some decent size and fullness. Again, this can vary considerably.

Advanced

Five years plus in the gym.
Very good at executing the basic heavy compound movements. Understands how to use machines and align their body to target specific muscles.
Understands the little things, such as proper elbow trajectory in a row. Good kinesthetic awareness.
Have done drop sets, supersets, and other high intensity techniques successfully.
Mentally tough, as they've pushed themselves hard to bust through plateaus.
Can feel most muscles working well.
Very good at interpreting verbal cues.
Physiques can vary, but you might see some striations and vascularity, along with some "under the radar" muscle development such as hamstrings and rear delts.