Here is some interesting data on which age groups prefer to shop online. This is breakdown on ecommerce shopping by buyers age groups According to Statista:
67% of Millenials (or so called Generation Y) who were born from 1979 to year 2000, prefer to shop online
56% of Generation X (born in 60s and 70s) prefer to shop online
41% of Baby Boomers (born between 1946 and 1964) prefer to shop online
28% of seniors prefer to shop online