I'm 80.....don't know my swing speed, but on hard ground, downwind, downhill, IF I hit a sprinkler head or two, I can still reach 200 yards OCCASIONALLY. This usually calls for a celebration (even though it slows play down, if it gets out of hand). More likely, a well hit drive goes about 185-190.
So, I've been playing the gold (senior) tees exclusively for a couple of years now, which are anywhere from 5200 to
5600, depending on the course. Most of the "young bucks" I play with (anywhere from 72-75 years old) have finally given up and moved up front to play the same tees as I do.....