Hey Rebs, sorry 'bout the slow reply. The namesake to our hometown Elementary school passed away on the 29th and it has been an emotional weekend for the community. He was an amazing man, involved in Boy Scouts, education, business, politics... It has also been fantastic weather here which might not last, so we are outdoors, and my son went away camping so I had to check his packing and busy when he returned... So much happens when you think nothing is really going on!
When I first clicked on the subject line, I totally thought you were being facetious. Sounds like you were serious? I suppose I've been colored by other retirees I had read about (Bogleheads, E-R.org) who followed up a semi-math related career with math-heavy early retirement and deeper application and learning post-career. Once you are relying on math for your 'livelihood' I would think you'd want to ensure you stay sharp, for a while. The basic math is behind you, but optimization allows for endless manipulation and leverage and understanding of new ways to ensure that the math is working for you.
Unfortunately the sites I was trying to link to are gone (bobsfinancialwebsite, gumby's math at Bogleheads, and my own 'sophisticated' withdrawal strategy / math that I outlined on my now defunct site). Oh well, as long as the missing of the math does not result in a bad outcome, I'm not sure why I'm championing it :) I guess personally, I love math and will always have it be a juicy part of my life, but I understand that some folks don't feel this way. I also sense people feel the same way about difficult literature - symbolism, abstraction, metaphor... They are not necessary, but to me oftentimes worth the effort. Do you want black and white or do you appreciate shades of grey?