Shawn, Don't worry about it. We are constantly changing. Yeah, you will continue to experience physical and personal changes that will affect the way you feel about surfing, and everything else for that matter. As Foondoggy and others have said, injuries and metabolism have a lot to do with it.
Physical training is vital.
Conditioning requires that you keep working at it, you'll have more fun when you go out, and when its epic you'll be ready for it. They will continue to suck you into their lifestyle rather than the one you would choose. If you survive, you won't be surfing anyway. Check your equipment. Keep your equipment up to date.