It is not too late to get into Bitcoin, you should not regret it at all. Always remember that it is wise to pay attention to Bitcoin and stick with it from the moment you learn about it. If you do not use it after learning about Bitcoin, you will miss it a lot because the position you see now may not be in this position later. You can start investing with any amount of Bitcoin and hold it for the long term because Bitcoin has a lot of success in long term investment.
We can do nothing about people always thinking if they are late. I'm not sure what LATE means for them, but I would not dig deeper and think badly because that only ruins our plan. If we think that investing in Bitcoin is worthy, then we make it happen rather than doubting it. We just know how it really works when actually it is in our control.
I expect the same question a few months from now. And still don't hesitate to encourage them to give small-time learning bitcoin and open their door to this another profitable investment.