I definitely don't think I need to work but I thought it was now or never. It allows me time to catch up with an older relative I am close to. I doubt it will last long.
I don't think IRMAA will apply to us unless we inherit some money from that older relative and I don't like to plans for something like that. I've tried modeling numbers in a spreadsheet and it is possible but not likely at this time. I want to make sure I get my father's inheritance RMD's done before I hit 70 when I start social security.

Once I leave this job, then I should be able to maintain a low income for a few years and do some Roth conversions to further reduce the chance of IRMAA.

As someone else said, it is probably best to have something close to a 50/50 split (roth/tradIRA). I think some people are too obsessed with Roth accounts and will likely pay a lot more taxes to convert into Roths than they need to.

I have a small pension now (COLA), then both of us have very small pensions at 65. I'll take social security at 70. Not sure about my wife. I've used various calculators and get differing numbers. If she gets it earlier it saves us spending down the savings which might be important if I pass away first since that reduces my one pension by 50% and also my wife would only get my social security instead of us getting both.

Thanks.