IPF rules
IPF weight classes, but get rid of the 59kg division - if you look at the numbers, the under 59 guys are lifting just as much as the 66kg guys. This makes it 7 weight classes, one less than IWF. 8 is too many. 4 too few. 5-7 is about right. I don't mind ProRaw weight classes, but I think a minimum 80 is too high. One of the best things about powerlifting is its inclusiveness. Guys like Fedosienko and Michael Kuhns wouldn't get a run in any other sport. 65 / 80/ 95/ 110 / 110+ might be a good compromise. You can take a purely numerical approach to determining weight classes by examining results from world and regional championships. This is pretty much what the IPF technical committee did when they changed the weight classes a few years ago. Side note: I found it ironic that it was so such a controversy at the time and yet pretty much everyone here agrees there are too many weight classes.
Age classes - Youth (under 21), Open, Masters (over 45)
Age classes should exist for records, separate age comps and qualification purposes only. There should be no age coefficient to determine an overall winner by formula across age divisions, that is ridiculous. Wilks is not an age coefficient. Best lifter is best lifter. You can have a separate junior/masters best lifter trophy if the level of competition justifies it, just like we sometimes award most improved etc. IPF has the numbers to run a separate junior worlds and masters world. We don't currently have the numbers in Australia to justify separate nationals, but if we eventually do, separate age based events have merit, which is why they have them in just about every serious sport.