If it's important, then save from now even though your income is small. Because that's not the only reason for anyone not to save money in their life, especially if it is to maintain their health and to balance their life in old age if someone doesn't get a pension from the government. Apart from saving money from now on, everyone can also invest in real estate and also in currencies like Bitcoin because these two things can also help someone manage their old age better.
Not everybody knows how to save or even drag their hard earned money to invest in either Bitcoin or real estate like you said. Not that they don't want to but they need a push, like someone to push them to make that big move (although we still have people who does things without being pushed to do it).
I know of someone who used the little money he gets from his hustle to build his own house, not that the money is even enough but he did it 50/50, invest in half of it and use the remaining to take care of himself and his family, now he can smile and enjoy his sweat. Even the old can save talk less of we the younger ones, we have brighter ideas on what to invest on.