Danny Elfman's voice change

From what I remember, he still sounded a little bit like his old self singing Bone Jangles' song in Corpse Bride, 10 years after OB's final concert. Even when he began performing the Nightmare Before X-Mas live in the early 2010s, did his voice sound lighter and more expressive, compared to his deeper and darker vocals from recent live shows where he sings material from Big Mess and Oingo Boingo in a much more restrained way.

Is this a style choice, is it because of age, possible effects of steroid/TRT usage, etc.?