My parents thought that bitcoins that cannot be seen or touched cannot be an asset. They think that investing in physical assets such as gold, bank deposits, land etc. is more profitable than Bitcoin. But even after I convinced them, they are not ready to invest in Bitcoin. They don't want to believe in virtual currency.
Maybe your parents have no experience with cryptocurrencies so they want to hold their money in physical assets instead of bitcoins. The older generation is not as educated as compared to our new generation which is why they don't believe in virtual currencies they think they are all scams. You can convince your parents that if you spend the same amount of money in physical assets, you will get more profit in bitcoins than in physical assets. Maybe they'll be tempted and tell you to invest in bitcoins.
It is true that people who are not yet aware of Bitcoin and Cryptocurrency and have no knowledge about it will never venture to invest here rather they prefer to invest over gold. We are the current generation they are all successful in making money in Bitcoin and they are all educated but the older generation is not so educated and they don't have much idea about it. Older generations mostly believe that currencies can be scammed anytime and are not trustworthy but we know that Bitcoin is the only version of currency that has gained worldwide popularity and it is a currency to be trusted. But if you invest in physical asset gold, it may take more time to get profit but it is not risky, but you should know that investing in Bitcoin can make you lose money because there is volatility in the market. There is no harm in investing in gold but it is also profitable but old people don't like to invest in bitcoin they only believe in hearsay, but we always believe in bitcoin, and think to get a lot of profit by investing here.