In somebody’s day
Definition 1 of 1
Pro Tip 1/3Timeframe Reference
Used to highlight a period in the past, usually a few decades ago or when speaking of one's younger years. 
In my day, we respected our elders much more.
Pro Tip 2/3Nostalgic Tone
Often implies a longing for the past or a belief that things were better or purer then. 
People really knew how to dress in my day.
Pro Tip 3/3Generational Contrast
Used to contrast past generations with the present, sometimes leading to intergenerational discussions. 
In my day, we didn't have smartphones to distract us.