Most of them are from elderly people, but there are also a bunch of young people who have likely died from side effects. PEI reports 21 people under 40 who died from thrombosis after Astra Zeneca.
Biontech and Moderna had other side effects (myocarditis for young men), and also a bunch of young deaths.
Johnson is not common enough in Germany to make any reasonable judgements.
Severe side effects (not deaths) are around 0,2 per 1000 shots. (reported side effects, actual number may be higher)
Source (in German): https://www.pei.de/SharedDocs/Downloads/DE/newsroom/dossiers...