“Sing. Sing a song. Make it simple to last your whole life long. Don’t worry if it’s not good enough for any one else to hear…” Wait a minute! Albert Asfazadour and his wife, Gail, want you to sing, especially if you’re over 50, but you gotta be good. That is if you want to compete in the Brooklyn Senior Idol, a homegrown version of American Idol for the 50-plus crowd.