If a person didn't sell at 65 why would they sell at 35?
If they need the money at 35 for living expenses they are not handling their finances well.
Well, with that argument, I wouldn't say that he/she is not handling his finances very well, but probably all his money on crypto right now. In any case, still a win-win, if you are going to buy at the current dip and be a long term holder.
Yes, there is TA that can help us, but I'm sure that majority here are doing any TA, they just buy when there is opportunity, hence that old saying is applicable.