Kenya was on a decimal system much earlier ... they had schillings and cents (Kenyan 1942 "ONE CENT"), not pence.
Oh, I see the 7s. 6d. was already questioned. See my post and links at 1353. Kenya was on a decimal system long before 1964, and Australia not until 1966.
I had the same problem with the currency.
7 shillings, 6 pence is consistent with Australian currency in 1964 (12 pence to the shilling).
However, in East Africa they were using shillings divided into 100 cents.
Also, in Australia, a first world country, paying 7s, 6p was not an unreasonable amount to pay for a certified birth registration.
But in Kenya, a third world country with millions and millions of people living at subsistence level, 7s, 6p (setting aside the incorrect currency designation) would have been an ENORMOUS amount for the average Kenyan to pay for a birth certificate. Now having said that, it may have been that most Kenyans did not bother, or were not in a position, to have their births registered, but still, for those who did, that would have been extremely expensive.