Mind Bubble #2
Headcannon: Danny’s human form cannot age.
This is working off the assumption that ghosts can’t get sick (in a human standard) and that they have amazing healing/regenerative abilities and that all of that can affect Danny’s human form.
(Wait if Danny was an amputee would his limb grow back if he willed it to? The only possible amputee I’ve seen is Frostbite.)
The main causes of aging in a human body is unhealable wear and tear over the years.
If Danny is able to heal from passive damage like this as soon as he gets it he won’t die from old age (still have to do research on whether that can affect the growth of his body (hormones?) or hair growth.)
(Ex. Hair in the ears getting shorter as you progress through life because noise is unavoidable. Multiple injuries or not use culminating in the loss of function of a limb. Winkles because as you grow older the body starts to shrink)
On a bad note it might be easier for Danny to develop cancer if his human body is working overtime like this.