The F-15c was developed 40 years ago, and it’s still the 2nd best pure fighter in the world.
The F-15 can’t hold a candle to the F-22 or F-35 and I’m not sure about China’s stealth fighter. Eagle pilots say in red/blue mock dogfights, they never even see the F-22 or F-35 when they get the signal that they have been shot down.