Formal:
* Faint oed ydych chi? (This is the most formal way to ask)
* Pa mor hen ydych chi? (This is slightly less formal but still polite)
Informal:
* Faint oed wyt ti? (This is the informal version of the first formal option)
* Pa mor hen wyt ti? (This is the informal version of the second formal option)
* Sawl blwydd oed wyt ti? (This literally means "How many years old are you?" and is a more casual way to ask)
To ask someone else's age:
* Faint oed yw [person's name]? (For formal situations)
* Faint oed yw hi/ef? (For informal situations)
Remember:
* The formal versions use the polite form of the verb "to be" (ydych chi) and the pronoun "chi" (you).
* The informal versions use the informal form of the verb "to be" (wyt ti) and the pronoun "ti" (you).
* You can replace "[person's name]" with the actual name of the person you're asking about.
These are just a few examples, and there are other ways to say "how old are you" in Welsh depending on the context and your relationship with the person you're speaking to.