  A specially interesting subgroup of asteroid families are young ones, i.e.
those formed less than 10 Myrs ago. They have attracted a lot of attention
since the first such family has been discovered in 2002. About 20 young
families have been discovered so far, but new discoveries are still very
important. Here we report discovery of four new young asteroid families. Three
of them are located in the inner asteroid belt, namely the (525) Adelaide,
(6142) Tantawi and (18429) 1994AO1, while the family of (2258) Viipuri is
located in the middle part of the asteroid belt.
