The thing with older people or at least most people from any preceding generation is always that people find it difficult to accept change or learn about newer ways of doing something. ( a case of why change something if it's not broken thinking). As with any of the newer technologies most people of older generations have always struggled to adapt. Think about things such as email/ Mobile banking/online shopping etc and you will find most older people are still not proficient enough to do this largely because they do not trust these things enough or have not willing to educate themselves about these things. I mean i still often have to help my parents with things like online shopping while my grandparents just don't trust the concept and prefer to only buy things directly from a brick and mortar store because of a lack of trust in making online purchases.

So IMO most older people ( not all of course) will not bother about learning to use something new as long as they can still use their tried  and trusted methods first. And even then the interfaces for using Bitcoins need to get way simpler for them to use.