You get trapped by stories. Though I've got this reputation for being out of control, it's not true, it just happens to be a more interesting story than the truth. ↗
Apart from the fact that your physical ability starts to decline, I also think someone in their fifties being childlike becomes a little sad. You've got to be careful. ↗
Enthusiasm is not the same as just being excited. One gets excited about going on a roller coaster. One becomes enthusiastic about creating and building a roller coaster. ↗