Hi John:
My best time on 400m (self-recorded, so it's got to be iffy) is just under 70 seconds, but I wasn't actually trying to get one fast lap - it was one of a series of half a dozen or so, so there was some kinda sorta pacing in there (but not much). I can't recall my 100m time, probably around 15 or so. I'm not a million miles off then - maybe I can indeed have some fun too! 
It's starting to warm-up a bit here in TN, so maybe this weekend I can go to the local track and get myself a "new-season" starting point for time (self timed again, but it's either that or nothing). 
I'll try to sneak a IBDR session in before hand (possibly later tonight) - I'll run hard and fast, but it won't be measured distance wise, I'll just have to go by stop-watch time. There's no rhyme or reason in my training right now, I'm just trying to stay fit, so this is as good a starting point as any.
I am also doing a lot of strength-training - again this is focused not on becoming a track athlete (never could I associate those words to me) but rather to again keep myself in good/better shape. This will impact both my ability to run as well as my overall performance. I expect my initial running times will be quite slow relative to where I got to last year, but I'll post them here anyway, just for the fun of it. 
I'll also post my thoughts on IBDR after I've tried it out. It'll be interesting to see if I do it just once or whether I like it enough to make it a staple part of my sprinting workouts. 
I'm enjoying the conversation, I appreciate you taking the time to chit-chat on this - it's hard to find folks my-age who want to do this. 
WiZ