Modern handguns will last a long time with proper maintance.
"M&P9 endurance test gun-- brand new still in its box back in April — finally cracked its slide at 62,333 rounds."
http://pistol-training.com/archives/998
"it’s been a crazy week with the P30....
At about 86,000 rounds, I noticed the trigger pull on the pistol felt different. It was stacking a lot and became very stagey."
http://pistol-training.com/archives/2626
"More than 20,000 rounds later, with no failures to feed or fire and hardly any wear to the gun's finish, I have no trouble whatsoever betting my safety on its performance. "
http://springfield-armory.primediaou.../SPstory11.php
"..the fall of 1995, after having fired a total of 100,000 rounds of virtually all kinds of ammunition...
Nothing has changed"
100,000-Round 9mm Torture Test
By Chuck Taylor