I Bought Shinkansen Tickets for Travel of Osaka EXPO, But...

Today, I bought Shinkansen tickets for travel of Osaka EXPO with my father. For the discount coupon of shareholder of JR East, I could buy about 50% value. But, recently, I'd understood that my physical strength and guts have decreased far more than when I was 20s. Because I've not been able to rise the hill from my favorite church to my home. I'm anxious whether I can bear walking around in the venue of Osaka EXPO from morning to night. The time I want to sleep has increased recently too. Always, I can sleep about 5.5 hours every night. Perhaps, for future, I'm likely not to go abroad. What will my dream that I want to watch various things of Japan and the world become? What will I become because all of physical strength, guts and stability of my mental has decreased much?