The following ideas are my opinions, based upon my own experiences. I don't have any data to back this up. I wouldn't apply to immature companies (startups and

The following ideas are my opinions, based upon my own experiences. I don't have any data to back this up. I wouldn't apply to immature companies (startups and similar), as I think they are going to be the most prejudiced. I think the opportunities for you will exist in healthcare, banking, govt. or utilities that need skills like yours. I feel there are lots of good paying jobs in these types of companies that would be more open hiring an older worker. I see you have R and Python along with some SQL, perhaps this along with your PhD in math could be leveraged into a data science job, or jr position in data science. Take a look at kaggle.com, perhaps you can do something there to get your foot in the door.