Taichi chuan is an art so profound, you're unlikely to 'graduate' even after a lifelong pursuit.
And yet, you can benefit from practising it from day one.
It is such a vast discipline. While the physical elements alone will require tremendous amount of time and efforts from you to grasp, there are also the spiritual and mental aspects that requires strong commitment to develop and internalize.
Be patient, therefore, when you are learning tai chi chuan.
It is not uncommon for people to have practiced the martial art form for 10 years, and still find that he's still a 'beginner'.
On the other hand, the essence of tai chi is the same, whether you are a beginner of tai chi or advanced practitioner.
This is exciting!
This will mean that you do not need 10 years of leaning to benefit from tai chi.
Chances are that you would be doing similar or even the same movements and applying the same principles. The main difference is in the depth and refinement of the mastery.
So even when you are new, and practice just a little, you will enjoy benefits of the art.
... tai chi for beginners ...