At what age can we help to dig our LO's ear wax?

I would not recommend you digging the ear wax. It will come out on its own and just clean the ones that you can see visibly. Also, I know that there are cases when the ear wax has hardened, if this is the case watch out for the symptoms like ear ache when ears get wet. You might want to visit an eent for this. But I would not recommend you doing this by yourself.