About when you're 13 or 14 will be a good age. If you have to ask, you sound young. I would say talk to your parents and see what they think. They are only looking out for your best interet. However, in my opinion, I would probably say no younger than 13.
If you want to ask someone how old they are just ask them.
ask one of her/his friend or ask one of your friend to ask her/him.
You can ask someone how old their brother is by saying, "How old is your brother?" Alternatively, you could phrase it more casually by asking, "What age is your brother?" This keeps the question straightforward and easy to understand.
Cuantos anos tienes?
"How old are you?" in Norwegian is "Hvor gammel er du?"
There are many questions that you can ask someone such as....What's your name?What grade are you in?How old are you?
If you want to know how old someone is just ask them.
Ask someone else
Ask someone else
Yes, of course you can. [although some ladies may think it rude to ask]
Just tell him how you feel. Getting someone to do it for you is so elementary school, and if you're old enough to actually be asking someone out in the first place, you're old enough to not hide behind your friends' skirts.
hun, ask someone out? but you're a bit young