Is it normal to start going bald or gray at 27?

Depends. Causes of hair loss include, but not limited to : vitamin deficiencies, poor diet, thyroid issues, anemia, hormonal imbalances/changes, medications, genetics, tension of hair (pulling back), damage from chemical treatments/dyes, obsessive pulling (trichotillomania) - the solution is find the cause, as each cuase has different treatment. Would talk to your physician and consider labwork.
Graying of hair is. related to genetic predisposition. Age of initial graying is largely a matter of genetics. However stressors: nutritional deficiencies, chemotherapy, traumatic head injuries, low vitamin B levels, zinc deficiency, severe illness, surgery & marked emotional stress may impact earlier depigmentation in people who are already predisposed to gray hair. Aging is a significant factor. In general –