Task: Identify the primary emotion conveyed in the tweet and assign it to either 'neutral or no emotion' or one or more of the provided emotions (anger, anticipation, disgust, fear, joy, love, optimism, pessimism, sadness, surprise, trust) that best capture the tweeter's mental state.
Tweet: At my age all I see is gray. Is it gray because of my bad eyes or my perspective #depression  #healingjustice
This tweet contains emotions: 
sadness