25...heck no! You'll be just fine. You might even be able to avoid the remarks from some passengers asking if you are old enough to fly the plane (ha ha ha, it wasn't funny two years ago
Get the engineering degree and then move on to flying if that's what you still want to do. Nothing says you can't work on the certificates while you are still in school!
Enjoy university and have some fun!
"A pilot's plane she is. She will love you if you deserve it, and try to kill you if you don't...She is the Mighty Q400"