Is It Possible to Lose 40 lbs by 40?

That is the question. Is it possible for me to lose 40 lbs by 40? If I do then I will be 40 and weigh under 140 lbs. Won't that be cool?

I was on my treadmill today and I thought that I needed to come up with a goal to help me lose weight or I am not going to stay motivated. So I got to thinking and realized my 40th birthday is coming up in November (10 months) from now and I started figuring out that maybe I will be able to lose some serious weight by then. So I came up with the mantra "Lose 40 by 40".

What do you think? Can I do it?