Like what's been said, I think a lot of this is luck of the draw. I started at 29, and I initially had rapid and dramatic effects, and then my physical transition seemed to stagnate. I still have my uterus, which adds another variable. I had a very deep voice (for a woman) before transition, and so my voice changes were less eventful than what some people experience. I'm 33 and I have too much beard not to shave but not enough to look like an adult. I've never seen much facial hair on my cisgender blood relatives, so I doubt that has anything to do with what age I was when I started hormones.
I will say that a lot of people start hormones later in life. It's pretty new that people grow up with awareness that this is a real thing that there are words for and treatment for, so a lot of transpeople had to figure it out and pioneer/bumble their path after being well into adulthood. They seem to get as good use out of hormones as younger people do. The main problem with older transitioners is there's a longer period of awkwardness when not looking one's age (or not being read as the proper gender) can have greater consequences than it would for a younger person.
Lol I forgot about the change in pee smell. Your whole body metamorphosizes and it's nice. Even if I failed at social transition I would have been pretty happy with the physical changes testosterone brought.