Misinterpreting intentions behind behavior is a regular problem. Cultural boundaries are not the only differences which pose difficulties for friendships. Gay-straight friendships must cross boundaries of both oppression and different culture. Disability raises issues around dependency and vulnerability, and fears of dependency and vulnerability. Places which are not handicap accessible can also make such friendships difficult to negotiate.
Age difference present another type of boundary.
Older people are often stereotyped as sick, boring, and inactive. Miscommunications may occur due to age-based psychological differences. Most basically, the author notes that there is a general preference for friends of the same age. This tendency is reinforced by widespread social age-based segregation.