Modern is relative. F-22's first flight was 1997. F-35 development started in 1992, first flight of X-35 was 2000 and F-35's first flight was 2006. There is absolutely noting wrong with using old technology. Being modern just for the sake of being modern is wasteful.
The F-35? Being wasteful? They wouldn't dare...
"We can't solve problems by using the same kind of thinking we used when we created them."