The movie, which is his father Rakesh Roshan's directorial, released Jan 14, 2000.
"Cinema sees me 15yrs old. Thank u 4 reminding me about d potential that lies ahead! Let's grow 2gether. Everyday! Thank u. Love u," he tweeted Wednesday.
Since his debut, Hrithik has delivered hits like "Bang Bang!", "Krrish 3" and "Koi... Mil Gaya".