A specific name for it and not just chemist or biologist.

Answer:
Not too many real scientists study anti-aging, but quite a few study aging.

Pharmaceutical researchers, medical doctors with an interest in it, and a handful of evolutionary biologists study the causes of aging.

Some keywords; gerontologist, geriatrics, ageing, aging, senescence.

Answer:
It might be Senescence.

Not sure, though check the page :D http://en.wikipedia.org/wiki/Senescence#…