I'm older than yo are Mr. Thaksin and walk my dog at a brisk pace some 15 or 20 km every day, rain or shine, warm or cold. Yeah, I get a bit tired in the evening. But no need for a bunch of doctors and/or hospital stays. Just get up and do it again the next day. The only thing missing for me is a small chunk of your billions, then, life would be perfect for me. Get yourself a dog (if you get a pardon).