Which model of Beretta? How is it used? Carried? In what kind of holster?
I've got a 92FS that I bought around 1991-92 timeframe. I carried it for awhile in a leather holster, but found it bulky for CCW use. Have carried it in a Cordura holster backpacking and hunting. It has some wear on the high spots but is actually holding up nicely for a 20something year old pistol. I've also got a 21a that has had a lot of pocket carry in a soft pocket holster. It is just about as old. It seems to have a simple Parkerizing on the slide and barrel, where the 92 is coated. It shows more scratches.
My wife has a Beretta 85 that has hardly been carried, and has done its primary duty as her night stand gun. It looks brand new.
That which does not kill you makes you stronger...except submarines, they'll just plain kill you.