There are generally no age restrictions for investing in Bitcoin or other cryptocurrencies, but minors may require parental consent. However, it is not advisable to introduce children or elderly individuals to cryptocurrencies without proper education and caution. These investments can be volatile, and it's important to seek advice from financial professionals and conduct thorough research before investing.
I think there should be an age limit when investing in bitcoin. For children who are too young, raised by their parents, there is no need to rush to learn about bitcoin, at that age should only learn age-appropriate things, not too much pressure. Give them a good childhood instead of forcing them. As for those who are too old, the age that needs to rest and enjoy life is also not suitable to invest in bitcoin. Bitcoin is a very volatile asset and investing in it is stressful, so it is important to have the right age and audience to avoid unfortunate crashes.
There are children (not infants or those who still cannot understand) that are advanced, like they are mature enough to learn this. Mostly, I found those children curious about things, mostly technology, which those kinds of kids should be guided in learning as this has a big impact on them, but those kids that just want to play and nothing else is to be desired should not be pushed to learn as it is useless as they can't understand it. It would be preferable if those kids already showed interest in learning how to earn money, which is the best time to teach it to them.
If you teach them about bitcoin technology and blockchain technology, then I will welcome, but if you teach them to invest and make money from bitcoin, I will disagree, even if they are passionate about it.
Teaching your child to earn money too early is sometimes counterproductive, not a good thing, because your child is of school age, if you only worry about making money without worrying about studying, it will be even more harmful to your child's future.
You see, the education industry has divided knowledge for each appropriate age, if we teach a 1st grader about 10th grade math, it won't help them get better. Finance and making money too, need to be educated at the right age.