These type of people will never invest in bitcoins:
1) The main issue with them is regarding their attitude. They do not want to learn about any new technology and are just content with the knowledge they have already acquired. At such, they will never try to learn about bitcoins or any other similar concept. If you try to convince them, they will give you lectures that it is all scam.
2) These people have already realized that they missed the train. I main they have seen the price rising from $1 to $20000. Most of them will think that there is no scope of more growth now in prices.