26: Age when he first rode at The Queen's Birthday Parade as Colonel of the Welsh Guards.
26: Years that have passed since he founded Waitrose Duchy Organic (originally Duchy Originals), conceived by Charles in 1990 as a way to distribute the organic food grown on the Highgrove House estate.
27.5: Cost, in pounds, to visit the Royal Gardens at Highgrove, the garden at Charles' private Gloucestershire residence that he planned and planted himself.
32: Age when he married Diana.
44: Number of Commonwealth countries he's visited since 1969.