shekhar

when i started my car in the morning i think i was a but rough when starting the car as in 1st self it didnt start and 2nd self it had a whining noise but it didnt start so i towed it to the dealers and w/o diagnose i assumed that the started is gone where as when the mechanic saw the car they said it is the timing belt NOW i have only done 50,000 on it how can it be the timing belt?