SSD lifetime question.

Hello guys,
Suddenly something pop up into my mind.
As you can see my current PC (see my signature), I am using an SSD on Windows 7 x64.
I wonder how long it wil gona last or at least untill I feel the slowing down effect.
Well...it is only about 3-4 months old, so right now, everything is still OK...
I am only curious about the lifetime.

Let say :
I use my PC about 10 hours a day.
Updated the programs regularly (OS, Antivirus, etc.).
About 2 or 3 Games come a go every 2 months, let say average of 15GB/games.
No video, photos, documents, etc. ever stored in the SSD.
Caching is destinated to the SSD.
Temporary used programs, let say, 4-6 of them in 6 months.
No scheduled virus scan, format, or whatsoever.
I am planning to fresh install (deleting the old one) the Windows once a year as usual (I will do this January next year)

I am expecting that the SSD to hold on at least 3-4 years.
I am really grateful if someone can say anything to this.
Thank you.