[Bill]

Hi Flipp
I'll try to help. Back when I was your age I worried about getting old. Then someone explained that there was only one alternative and I stopped worrying. The tables will help and so will aerobic conditioning but working on the mental aspect is the most important. You have to believe that with a little instruction and a few practice sessions you could double your static times. That will help but specific training will do a lot more. It seems to me that you could modify two known training methods of ours to your benefit.
This will sound like 'opposite/backwards' training but I've thought about it ever since I saw the Hawaiin surfers running on the bottom holding big rocks. Since you are comfortable in the water training dry will be safer.
1 You're not going to be rested and training should be specific, so take a gentle walk in the park and take a little time to visualize your prep for surfing.
2 When you are now (in your mind) sitting waiting for the right wave increase your speed or jog a little to simulate catching and riding the wave.
3 Dump your body onto the ground to pretend that the wave just won.
4 Tell yourself to relax and hold your breath for 15 seconds.
5 Go back to 2 and repeat for 8 reps while adding 5 seconds to each hold.
6 If you fail on a hold time, take 5 seconds off the last successful time for the next and complete the 8 reps.
IMHO
Aloha
Bill