If it were grey hair I would have been seeing the signs at age 21 lol.... signs of aging for me is how I feel, mentally and physically , like, sometimes, when I feel really really tired and run down, had a long week, thats when I feel a sign of getting old or aging, but ...when I'm having fun and partying and feelin goooood , thats when I'm feelin younger so the signs of aging in are in reverse when I'm feelin good ..