Yes, Jesus affirmed the Old and New Testament—and so do I. But I certainly don’t affirm a young earth, although I did do so for many years because that was my church background and I grew up under the influence of The Genesis Flood (1962, Henry Morris & John Whitcomb Jr.) As to Jesus, the New Testament doesn’t record him taking a position on the age of the earth or whether or not the Noahic Flood was global.
I agree that there is a “prophecy” of a sort in 2 Peter 3 but I don’t see any affirmation of Young Earth Creationism in it. (And as I’ve mentioned in the past on these forums, I see evidence in the Greek text which would actually weigh against a global flood.)
Anyway, 2Peter 3 may merit its own thread, if you like. We’ve certainly covered it before on these forums, so you could also pursue it in the archives if you’d like to get a head start.
Lastly, I do very much like your recently adopted thumbnail-icon identity. My thumbnail has an ancient origin of its own, a whimsical cartoon character planned for a Dr. Suess-like children’s book: Zack the Ex-YEC Yak.
Also, I appreciate the “diversity” which our YEC participants bring to these not-really-echo-chamberish forums.