FaceApp unfortunately only has an ‘Old’ filter, no middle-aged filter, so my crude ageing technique can only do old old. I can approximate a sort-of middle-aged look by blending the old face on top of the young face at a reduced opacity, however.. It doesn’t really resemble Hayden’s actual ageing, though.
Now that I’ve had the chance to revisit this, I reckon that the 35% works best. Anakin was 45 years old when he died so having him look that way makes WAY more sense than the 22 year old we got!