Hello Magali Ji,
please also check the planet is going which navamsh then you an get best idea what will happen in that age. as this course belongs to advance level, here we need to check the navamsh also, in the first case the year 16th give mars results as dk, also check mars is in which navamsh and nakshatra.
yes dk planaet can give relationship, here you can use jaimini black chart predictions as dk is placed in the sign of dk.
o=in 17+ it was 18th running, please use normal bcp and check what is happening, 6th house was activated in the age 17+ thar is 18th year going.
Venus is with a4 also check Venus is is in which navamsh and nakshatra.
28th year moon activation, please check whether residential place change happened / any travel for the same
Yes, special positions planet give more prominent results in a chart.