A Little White Lie to Protect a Memory

I recently told my grandson that I remembered his late grandmother perfectly when really some details have started to blur over time. It was the moment we were looking at old photos, and I couldn't recall the exact color of her favorite sweater. But it felt like such an important detail for me to hold onto, to keep her memory vivid and alive in our family stories. Was that just a normal little white lie to shield against reality, or am I overthinking this? What do you all think about keeping those cherished memories intact even if some details fade?