"As one grows older one becomes more critical of oneself and less of other people"

This quote by Basil Rathbone speaks with the concept that as we age, we become more familiar with our own imperfections and errors, and less likely to judge others for theirs. This might be because we become more aware of our own death and the truth that we are all human and make errors. We may likewise become more familiar with our own privilege and the reality that we don't understand the complete story of someone else's life. As we age, we might become more compassionate and understanding of others, and less most likely to evaluate them roughly. We may also end up being more knowledgeable about our own limitations and be more forgiving of ourselves. Eventually, this quote talks to the concept that as we age, we become more familiar with our own humanity and the humankind of others, and less likely to evaluate roughly.