Was Freddie self-conscious about his age at one point?

At Waturbury 1975, Brian apparently put a lot of emphasis on Freddie being young prior to ITLOTGR. He also did this at the rainbow but didn't stress it as heavily

Source for this? Sounds untrue.

I was looking at the Queenlive ca article on the show

It's common for 'the young mr...' to be added as a friendly introduction - be it ironic or just meant kindly.

Brian always got tongue-tied on stage.