You can use the Inspect Tile tool to get more details about a tile.  In the LiDAR15 and LiDAR 7.5 DEM products, the Inspect tile will indicate the year(s) the data was flown.  In the Cadastral & Title pre-cut tiles product, it will tell you the last update date.

To use this tool, click Inspect Tile in the map tool bar.

Click the area you would like details about.