Hi, Welcome to HealthcareMagic!
At age of 32, though greying of hair is premature, it maynot be reversible. Treatment of hairfall: do as follows:
1) Check your Hb-- if anemic start an iron preparation, & take nutritious diet
2) If dandruff-- use anti-dandruff shampoo 3-4 times a week
lotion 5% locally 2 times a day
Let me know in about a month or so. Good Luck