He was 96 and he was 5 when he was at Ford’s Theater.
If you watched the entire clip he said he wasn’t aware of what happened to Lincoln, he did see Booth jump to the stage where he broke his leg and that was his most vivid memory.
An example of the latter is seeing a bright green, tiled wall while cradled in someones arms. It isn't a vivid, detailed memory, just a flash. I was in the hospital twice as a child. Once for tonsils at 18 months (doubtful) and once for eating a bottle of baby aspirin when I was about 3.
It is easy for me to accept this woman's memory is accurate. But my grandmother would say she only heard someone talking about it.:)