The voting age was lowered to 18 because so many things are required of a person at 18. We still don’t allow most contracts to be signed exclusively by an 18 year old. (An “infant” under the law until 21, which makes no sense.).Personally, I’d raise the age of everything to 21, both for responsibilities and for privileges. Most people seem to mature a great deal between those two ages. I’d much rather a 21 year old enter the army than an 18 year old because of his/her ability to deal with it, for example.