I doubt it's of any consolation to tell a 22 year old that the Prophet (PBUH) had grey hairs. Rasulullah was most likely to be middle-aged or past when he only had a sprinkling of them. Some hadith say 14, 17, 20. There is a disagreement. Or the hairs were simply counted in different periods.
Brother Biz, first consult an ayurvedic doctor as there is a reason why your hair's turning grey at this age and ayurvedic medicines treat the cause as well as the symptoms. I don't know if the greying can be totally reversed, but with the right treatment it can be stopped. Success depends on the patient too. In ayurvedic/holistic systems avoiding harmful things is vital to the success of the treatment. In the mean time if you really can't hack it, dye it with henna and indigo, but please do not use chemical hair dyes. They are toxic (contain parabens and other nasties) and have been linked cancer of the bladder. Imagine if they reach your bladder what they must be doing to your brain. If you need any kind of help/advice, please let me know insha Allah.