To travel abroad by yourself you have to be at least 12 years old; however, if you are younger than 12 you can pay the airport a fee to watch your child and help them travel safely for children as young as five.
No
yes because it has not expired
no
Yes
Once you get the US citizenship status you have full freedom to travel abroad with the US passport.Any problem while you travel the US embassy abroad will help you. You can apply for work in the judiciary only as a US citizen. You get the right to vote also. You will be eligible for many government sponsored benefits.
If you are looking to travel from cities only inside the country of the US then just have valid identification cards with you like your SSS ID. However, if it is an overseas travel or travelling abroad, then a passport is needed.
Next year, I'll travel abroad.
If you are coming from abroad then yes, you still need your passport. The passport is a very important travel document which you should always carry when you travel in and out of the US.
You need the passport of the country of which you are a citizen. You cannot have a US passport until you are a US citizen.
For the same reasons anyone else travels abroad.
No
no but it is advisable