Rather irritatingly calls himself and everyone interested a "Mathlete" (typical American marketing tool) but did say - take your age (68); add them together (6+8=14); then deduct 14 from your age (54) and add the two together (5+4) - it ALWAYS reaches 9.

It works! Why?

I know a similar phenomenon.......take a star sign, talk about Mars in Uranus and the effect of the star stream through the middle of the month............and you'll have a long and happy life..........you know where i'm going?

.....listen to that, think about it, and come to the same conclusion each time that its always b*ll*cks : - )

It's easy. All you need is algebra.

Let the age be given by tu, where t is the tens digit and u is the units digit.
Then the sum of the digits will be t + u.
Deducting the sum from the original number we get 10t + u - t - u = 9t
Note that 9t is a multiple of 9.
Furthermore, t is likely to be 9 or less..refer to original age.
In any multiple of 9 up to 81, as is well known to primary school learners of times tables, the sum of the two digits is 9.

It's not maths but ask a mathematician to take both hands out of his trouser pockets and give them both a sniff. The odd thing is, one hand will smell of fish and the other one of cheese. Always.