* "What is your age?" This is signed by making the sign for "age" (the sign for "year" with a slight twist of the wrist) and then pointing to the person you're asking.
* "How many years old?" This is signed by making the sign for "how many" and then the sign for "year" with a slight twist of the wrist, followed by the sign for "old".
It's important to note that context and facial expressions are crucial in ASL. When signing these questions, you would use a questioning expression on your face and might use a slight head tilt or eyebrow raise.
You could also use a more informal approach by signing:
* "Your age?" Simply signing the sign for "age" while looking at the person you're asking.
The best way to learn how to sign "how old are you" in ASL is to find a qualified ASL instructor or take a course.