what is your greatest fear??? & why do u fear this???

You know what, I fear of growing old. I see many old people around. I feel pity for them, specially when I see some who begs for a few amount of money, or still work late at night in order to eat. Can you imagine that? As you grow older, your becoming more weaker day by day. Your loosing your strength and speed. I'm just hoping that when I reach that age. I am ready & financially stable. I don't have to worry at all. I think it will be more harder to grow old without someone beside you. That's more fearing i guess...