The above post explains my point a bit more, except I'm posting on a phone and can't be arsed with a million clicks to get brackets done neatly.
To amend my earlier post... The same would apply to any list, really, not just one describing a person. It is simply not necessary to repeat the subject of the sentence. For example, if you were describing a car, you might say: The car is a Ford, and is 5 years old. I very much doubt you would say: The car is a Ford, and the car is 5 years old. However, that is what is being suggested with repeated use of "I" in the sentence in the OP.
To amend my earlier post... The same would apply to any list, really, not just one describing a person. It is simply not necessary to repeat the subject of the sentence. For example, if you were describing a car, you might say: The car is a Ford, and is 5 years old. I very much doubt you would say: The car is a Ford, and the car is 5 years old. However, that is what is being suggested with repeated use of "I" in the sentence in the OP.