You're all a bunch of geezers aren't y'all?
Clocked 40 a couple months ago as well.
It's tougher, but not too bad. I'm still in decentish shape - boot camp style work out for about 45 minutes every other day helps. Tweezers are useful for plucking out the beard /stache greys, or I shave when I can't keep up. Locs are still intact, although not growing with as much reckless abandon as they used to and more prone to damage.
Father Time is relentless, inevitable. But we do what we can to slow him down.