Why should someone be humble because they're elderly? You do realise that this was a light hearted response to a private Q&A session, don't you, and that there is no "bellowing out"?
Frankly, I'm reminded of a wee discussion with my 11 year old son recently where I had to correct him on a minor thing he was wrongly insisting was correct - and told him that I was'nt young enough to think I know everything.