Is this advice applicable to people of all ages? Actually, I mean, how would you advise those of us who are young (20-40) and those who are over 50 to save money in Bitcoin since they are not as familiar with technology as the younger generation.
Yes, the advice is applicable to anyone, and when it comes to Bitcoin, it doesn't discriminate based on age or background. Everyone can invest in Bitcoin; there is nothing too difficult for those who are not familiar with technology to invest in Bitcoin.
The main thing is to have a good non-custodial wallet and to understand security and privacy (handling of the seed phrase). With this, you are good to hold Bitcoin. You don't need to do anything technical while you invest in Bitcoin. Anybody can invest in Bitcoin; the most important thing is to ensure you have a source of income that you don't need to rely on for your Bitcoin investment.