Young or adolescent.
mature, artificial, practical.
trustworthy, sensible, mature, reliable, dependable
Some synonyms for "old" include aged, elderly, and mature.
Grow the heck up
Because you have yet to mature.
Fossil is a synonym of old and antique and begins with an F.
No, because there not mature yet. And problems can happen and feelings can be hurt, because their not adults yet. As soon as your 20 or older you can get engaged or even married because you'll be old enough and an adult. Also its illegal to some countries.
10 years old's are slightly mature. Let's say the 10 out of 100 precent mature
Yes, because it is not a teen yet.
old fashioned
Elderly or aged
because they are not mature yet.......and they thinks its funny ....... =)