A very good friend of mine is into glass business, the other has a motorcycle business, one is a housewife, another worked as, well i am not sure what she does since she left the country, but I know she is into climbing and diving. I have other good friends doing something different from me and I have technical friends too. We all don't have much in common but WE ARE VERY GOOD FRIENDS!
Friendship is not based on having something in common or having meaningful conversation. It's much deeper than that. When my friends and I get together, we don't talked about our achievements or failures. We just talked about whatever there is to talked about. Most of it is nothing interesting. We just enjoy the company of each other with a couple of beers and pizza.
As we grow older out commitments change. We get married, start a business and so on. We have responsibilities. We don't get to hang out often but our friendship remains.