It appears the 1591 baptisms (labeled 1592 on page header) are also showing when people died and their ages calculated. This record shows William died in 1639 (or 1633 or 1645)
Technical Data
Dimensions: 1560x497 pixels (0.77 MegaPixels in total) Size: 425KB 96dpi 24 bpp, source file: ..\Scans\Baptism\Mather\1591-1639 William Mather.jpg