Going for learning law at an age of 30 or more is not uncommon. People over 40 are seen in law schools. Age surely is not an obstacle to pursue study of law. After spending some time of your life in other professions, if you think you want to learn law it is not a difficult proposition. At that age you may have a burning desire 
to get into the lawyer’s profession. That makes it easier to concentrate on your new love. Being in your middle age is very helpful. You have with you all your experience in life. Your approach to things will be more mature and diverse. You can analyze the information available better and differently. And if you have a taste for law it is easier to learn it. The previous career will bring in a lot of experience also.
There are night schools which teach law. They have the approval of the American Bar Association. It takes four years to graduate from such schools. But the advantage is that you are financially independent. While going to the school in the evening you can go to work during the day time and earn money. Since you can take up a full time job during this period there will not be any difficulty in looking after the needs of your family. Before going for the lawyer’s profession you must consider the negative side also. Law education is expensive and very hard work is expected of a lawyer to succeed. You may not get enough time to enjoy life. But the profession is highly paying.