Xers were the last group to get affordable homes and interest rates. their kids are off at college and getting married. The pressure is off. they are comfortable. They don't feel the need for bitcoin.
As an Xer myself, I've talked to so many of them. Many have told me what I say about money and bitcoin makes sense but that they don't want to risk their security on a possible scam.
it's actually my millennial nephew who is buying bitcoin now every month.