As a philosophy student, this resonates with me well. Sadly, we live in a world where people give half-baked opinions more readily than they are to stay silent - no thanks to social media. You're right, saying, 'I don't know gets increasingly difficult with age'. Unless we enact some cultural and sociological changes to reinstate this 'forgotten art,' I fear the future is doomed to have more people with loud voices, rather than more people with refined voices.