Is it normal to have white hair at 20?
Unusual.Less common, but harmless
Yes, you can have white or gray hair at 20, and it often runs in families. It’s less common than getting gray hair later, but usually harmless.
White hairs in your twenties are often down to genetics—if close relatives went gray early, you may follow suit. A few white strands can also show up without any obvious reason, and they don’t mean you’re suddenly aging at record speed.
If the change is rapid or comes with other new symptoms, it’s reasonable to ask a healthcare professional about it. Otherwise, it’s generally just one of those inconveniently early family traits.