Still confused with using Du

So I know the A2 level of German and try to have conversations with my colleagues in German. But the main problem is: should I address them with Sie or Du? This always confuses me. In the workplace, there are people who are younger than me and people who are much older than me. Also, I don’t know how to address my female colleagues. Now mostly the conversations are in English, as my colleagues want to improve their English, so I need to get over this Du or Sie confusion so that I can converse in German.