well the way i would do it is once the player hits a certain age then you kill all god powers so it should look like this
conditions:
tech status >> age 1,2,3 or 4
effects:
player kill all god powers >> player 1 to 10
and i guess u understand how to use the qv randomize then you grant the random god power.....but i dont use qv no more, i use fire random event...i forgot which download has this trigger in it but ask for it and someone will post a link