why some women age so drastically?

Was talking to a girl, she was 29.5 yo back then. Now turning 33 and her face aged like 8 years. She was stunning with no make up etc, naturally looked like a 22yo at 30. 

now at 33 she looks like in her late 30ies. she aged 15 years in 3. why some women age so brutally and suddenly :((

it was so sad to see how her beautiful face suddenly aged

There are certain ages where your body suddenly shifts (both sexes) and its usually early 40s and then in your 60s. But other than that it would typically be due to lifestyle changes, stress, etc

I don't think she changed her lifestyle, and she is not really a stressful person (afaik).

She has almost no melanin, so maybe it was because of sunlight exposure which degrades her skin that has no protection (melanin). I don't know, but it was sad