The F-15 is still a very good aircraft.
In some ways it’s better than the hyped joint strike fighter. Such as dog fighting.
Still think the best overall fighter we have is the F-22.
Doesn’t the F-22 have one of those high-tech skins that doesn’t like foul weather? The F-15 doesn’t have to sleep in air-conditioned hangars, so it has a much longer list of viable runways it can be deployed from.
If they can keep the B-52 in the air for half a century, they ought to be able to wring another decade out of the Eagle.