It has already been proven and a known fact that none of us who are active on this forum today will be alive to witness the last bitcoin halving, so it's not something new again. 
 
And to answer the next question: Bitcoin halving is not part of the reason most people invest in bitcoin; it's just that the halving reduces the reward the miners receive, which means the supply that is to go into the market will reduce, which will spike the price upward. 
 
We can't enjoy all the profit that will come from Bitcoin; let's just take what you can and leave the rest for those who will be here to enjoy it. Besides,  even before that time, you will be able to enjoy the benefits of your holdings long before the person gets very old and can transfer the holdings to the next generation if necessary.

I included a brief talk on the halving to iterate or bring to speed the newbies that may have been seeing the word fly around this forum without having as much understanding of it or as to why.

I also think with this reminder of how much time is left, it would be wise to key in and follow a plan to profit from BTC despite any FUD or FOMO.
We should do well to start teaching the younger ones or our offsprings or those we care for, about BTC and cryptocurrencies in general so that they can be fully equipped and engaged in it before we get old, tired and die with the knowledge and a wallet of coins.

By 2140, I'll have been old enough to have witnessed 10 American presidents.

I don't have any excuse for not investing in Bitcoin because I am already doing that. Rather you should ask me what's stopping be from expanding my knowledge about Bitcoin. And the answer is Bitcoin space is so wide that when I think about it, I don't know if I should focus on learning about mining, or the technical aspect. I am just too non-technical for it. I have a desire to teach Bitcoin to business executives but I am just too scared thinking that they may not be receptive enough.

I'll rather get a different point from this topic, I think this should act as a motivation to many others thinking they are too late to start buying bitcoin this should be a motivation that bitcoin would far outlive many of us and we are still to early to be complaining about price, many of our generation woudl be blessed if we buy bitcoin and stkre for them even if we are no able to use it all or end up over accumulating, it's far better that way that to actually have none, apart from for our generation any one that holds bitcoin for up to 29 years whoke still in his youth and accumulating steadily maybe with up to 1k monthly DCA or weekly based on his income while his mate spend it on parties would be close to having  1 bitcoin in 3 years if he does it monthly and this is not a very bad achievement to accomplish in less than 20 years cause only God knows what bitcoin would be worth then.

It's 116 years from now and if you will be born in 2024, you will not likely still be alive in 2140.

But the reality is worse than that, you were born much earlier than 2024 as now you can read, write, use devices to connect to Internet and access the forum. Very likely you are at least teenager at this moment so it is very impossible to be alive in 2140.

Even if you will be alive in that year, your body and mentality will not likely be good.

So please don't care about what will happen after you already die.

See Bitcoin controlled supply and Bitcoin Equivalent Network Time.

If I was still given life I would be 151 years old. But it seems that I won't make it to that age.

My reason is to make a profit (money) to help improve the family's economic situation for the better. This is because my salary is certainly not enough for me to save for the future. So I currently use crypto investment partly for the short term and long term.

2140?

I'm not sure what we're thinking, but most of the people here are >100 years old and even >200 years old, but ironically we don't have enough longevity to see everything happen. It's like how the kings of the past thought about their current lives, vaguely, but always wished everything well in the future.

Because I have had some memorable experiences with bitcoin, I am sure that I will always be ready to buy bitcoin when I have free money, at this stage the excitement of growth brings excitement. There are many stories that are repeated as well as talked about bitcoin.

Waiting for Bitcoin to finish in the mine will take hundreds of years from now, will we still be alive after 100 years? is it still a mystery, or we will only survive half of it. We don't expect to see what the future will be like with Bitcoin, we just have to give our next generation an understanding of how Bitcoin will work in the future. Giving an inheritance in the form of bitcoin assets would also be an extraordinary inheritance. we just need to be prepared for that.

It is not necessary to know if one will be alive or dead when the last bitcoin would be halved. The process is already programmed or automated for that time, if I am not mistaken. So therefore, it would definitely take place when the time comes for bitcoin to halve. Currently, we are just a few weeks away from halving, and we are all anticipating a good turnout as a result of the forthcoming halving. So therefore, age should not be a hindrance to being an investor or  a bitcoin hodler. It would even be better because your children would inherit your bitcoin investment if you were no more, and it goes from generation to generation.

With the above, I see no reason why one can not have the zeal and passion to get bitcoin for themselves as a long term investment plan. Even though one can not buy bitcoin, one can render services to earn bitcoin in payment for the services rendered. Skills, freelancing, etc. are just some of the things that can earn one bitcoin if they choose to do so.  However, other business ventures can decide to accept bitcoin if they deem it fit to do so.

Nevertheless, I believe the fuds and fomos are just a strategy by some group of few individuals who are always at their convenience to cause pannick while manipulating the market in their own favor so  that the faint-hearted would be fast to sell in order not to get trapped in the market  while making huge profit from the market. Recently, this was the case in bitcoin market and as usual, there was a drop in the price of bitcoin, leaving room for them to invest, ie buy more bitcoin to add to their already existing portfolio and allow the price to rise so they could take more profit

Every single one of us on this forum right now are millionaires. The amount of Bitcoins we own right now is worth millions by 2140. The truth is that none of us would be able to spend the money on goods and services since 2140 is outside our life expectancy.