The older people can only invest in what they understand and can see with there eyes. Fewer ones among them can relate with internet as much we young one do. Cryptocurrency is highly risky than the gold and bitcoin inform of its volatility and most of them cant take the risk with all their life savings. Gold and silver price are well predictable than in cryptocurrency. I know some cryto ethusaist will be old and will find it harder to convince their fellow colleagues on investment in the space.