It's the same thing as asking if there is an age limit for owning your assets and properties, there is certainly no age limit in Bitcoin investment. Both the young and old could participate, but they must be well informed about the investment before doing so.

However, this is applicable only to the core Bitcoin transaction whereby the privacy and anonymity of people below the age of 18 would be preserved. This could be done through the noncustodial wallet and decentralised exchanges. But if the investments are to be done with the custodial or the centralised exchange, KYC might be asked, and the legal underage would be restricted.

Why it must be a minor with Bitcoin investment? there are a lot assets e.g. gold, stock, real estate etc and the fact a minor can buy those assets even though it's need an extra procedure where his parent need to verify if they allow his kids to do that. Similar like Bitcoin, it doesn't have any restriction too if you use decentralized exchange, you only need your bank account.

Not all elderly want to get paid with Bitcoin, there are many El Salvadorians old people complaining and refuse to get paid with Bitcoin.

It would be against Bitcoin's code (pun intended) to have an age limit. There's no reason to stun opportunity from the young, so if they dare try to join the ecosystem or hold BTC, let them!

Unlike conventional and bank-related investments, there is no age limit for crypto investment especially bitcoin. But there is no point for kids to getting into bitcoin investment, especially at its current price. We might have heard some teenagers who somehow bought bitcoin and now being a millionaire, e.g. Erik Finman^[1], which he bought 400 btc with the $1000 his grandmom gave to him at the age of 12. But imo, that's possible to happen for him because it's rare to see a kid gets $1000 even from his close relative such as parents or grandparents, unless if he is from wealthy family. It could be applied to elderly people as well, which the only thing they care is spending their retirement time peacefully and not getting into any complicated thing such as investments, except for those who still have to live their family. Even for the latest category, they would prefer to invest on short-term investment like opening a shop so they don't need to wait so long to get profit and obviously with less risk.



[1] https://www.investopedia.com/news/who-erik-finman-bitcoin-millionaire-teenager/

I don't think small children should be concerned with investments, but I do think that an age of primary school is appropriate to start familiarizing a child with what money is, how it works, and what kind of money there can be. After all, kids often play games like Monopoly or apps that give them some tokens, which they can use in-game to purchase something or upgrade characters. So it's not entirely irrelevant. And in the light of discussing fiat, gold and other things, Bitcoin can also be mentioned as a kind of online money, but not the kind that a company or a country can control.
As for the elderly, these are adults, and unless a person is suffering from a severe cognitive impairment due to their age, I think it's totally fine to tell them about Bitcoin. Not to push them, but to tell them if they want to know something and at the level they are interesting to know of it. My older relatives who are in their late 70s roughly know about Bitcoin from me, although sometimes only at the level 'it's the Internet money', as some of them don't use laptops, smartphones or the Internet at all.
Bitcoin isn't just an investment, so it's okay to tell people about it in different ways.

There should be age limit because its easier to lose your Bitcoin if its placed in the wrong hands, every kids get better with Fiat and they hardly lose their Fiat money, but to keep Bitcoin safe many lessons should be learnt first, this is why I believe that automatically there is age limit for who can acquire Bitcoin and safely keep them, so, Bitcoin is not for kids, also, not all adults want to get into Bitcoin because they find it too complex too understand, I am talking about older people that don't know how to even operate a smartphone.

Technically there are no age restrictions. But, If anyone wants to buy Bitcoins from centralized exchanges, You may have to submit KYC, and you must be 18 Years old at least (Not sure if any centralized exchange allows underage people). There shouldn't be any problem teaching kids with Bitcoins. They don't have to invest just to learn about Bitcoin. We learned many things in school, but we didn't do everything. My friend Completed his studies in commerce, and now he is a Tailor. Let them learn; one day, they will decide what to do.

Centralized exchanges are not banks and so they do not offer any savings accounts for kids.

I mean, why should they, anyway? Exchanges are already shady enough to just disappear overnight with everyone's money. Kinda defeats the idea of having a "savings account" you know.

There's no age limit since this is unlike the centralized institutionizations that requires age for KYC and other regulatory purpose, bitcoin is a decentralized network and there's no age barrier, but we can as well adopt this for the sake of our up coming generations by investing with bitcoin for them to inherit, we can teach the young ones the basic foundations about bitcoin, wallet and blockchain.