I'm a 51 yr old male who is widowed. I am INFP and am fascinated by personality and observing the dynamics of interpersonal relationships with others. I can tell people's astrological signs after knowing them awhile and seeing which of those people, whose signs I already know, they appreciate .
MBTI is another story. Can't really see that in anyone except in those who prefer my company. For example, I have befriended a young woman at work and it turns out she is ENFP (which she knew and revealed). I find the comfort level talking to be remarkably easy.