Colorado Democrats announced a new bill Tuesday that will block anyone under the age of 21 from purchasing any form of firearm, according to The Denver Post.The proposed legislation would ban the purchase and possession of any firearm, including long guns and handguns, for adults who are younger than 21, saying they hope the legislation will help stop gun violence in the state, according to the Denver Post. The proposed legislation, announced by the bill’s sponsors Tuesday during an interview with the Denver Post, will likely be submitted as a Senate bill this week. (RELATED: West Virgin …