That's commonly known as the "tip-of-the-tongue", or "TOT" phenomenon. It's frequently attributed to the decline in cognitive processing speed, memory retrieval, and other cognitive functions that occur due to aging. When these parts of a human's cognitive function decline, it can make it take longer to retrieve your memories of an object, even if that memory is indeed stored well in your brain. As aging generally causes a decline in cognitive processing speed and memory retrieval, this can reduce or slow down the ability of the brain to retrieve the correct information about a given object, especially if it is associated knowledge, such as you remembering a particular trip you took, but not the exact date or year you took that trip on, which may take longer for your brain to retrieve, as it's not an inherent part of the experience itself in that memory.
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