I'm not entirely sure if the 69 year old man is being sarcastic, raising a different kind of awareness against transgenders, or he just really wants his age to be legally changed to 49.

The man kept on talking about his feeling, then the trans argued "it was not purely about feelings, it's about a sense of identity". Thinking about the "sense of identity", it made me think, how do I sense that I should be younger or a different gender?

On my point of view, legally changing the number of age is a stupid perspective. The number of age determines how long have you been living in this planet, and not about your capabilities.