My apologies if this is a redundant topic. I was looking for other people's strategies for making elders. Is it best to get a young worker trained on multiple disciplines early, and then just cycle through until master status is achieved, or do you let them become master of something and then start from scratch on something new?

Also, what seem to be the best strategies for making doctors and parents? I have never had a master doctor that I remember, and only two master parents, and they were both pretty old already.