When you are older, say, late 40s, you will become tired of life, and this is why: you know what will happen. Not at the end, which you do know, but that's not why you're tired. You're tired of life because you know that getting out of bed means your socks, your slippers, your robe, the bathroom, stretch, cat litter, cat feeding, breakfast, and so on throughout your day. You're tired because if you go out, you know what will happen. You know what it's like. You know your reaction. You know when you'll be tired. You know when you'll be sore, when you'll be angry, when you'll be filled with regret. You also know what others will do and how they will react.
You are tired of life because you see the days stretching forward and you see the lines of repetition, even the supposedly special events. Your naive excitement flakes away with repeated experience. You know there is no secret cave or an amazing person or hidden knowledge or adventure around the corner. They have all disappointed in the past. Even the exciting events are predictable. The forest isn't endless. There is no cache of money.
Your experience has made you see the future and seeing the future is disappointment because the future is the past is the present is the repetition of it all. It is why some people in "mid-life crises" will try to change their lives drastically: buy a flashy car, find a new spouse, experience a psychotic fugue. As anyone will tell you, it won't work. You know the car needs to be washed and the price of gas is going up. The new spouse is the same as the old spouse. The psychotic fugue will end and there will be paperwork.
Dementia could fix this.
