LL: We know that loSmaH ben jIboghpu' is how a Klingon would say "I am 40 (years old)". But how would you say "when I was X, I did such and such"?
MO: Maltz says:
qaStaHvIS DISwIj javDIch...
When I was six years old...
MO: This is a confusing one, because it depends on how you count age. So I'm thinking for klingons, from the time you're born, until you're one year old, that's your zeroth year. So in terms of numbers, it matches the way we do it in english.
wa'maH ben loDnI'wI'
My 10-year-old brother
LL: In The Klingon Dictionary, ben was translated only as "years ago". Later, on the tape Power Klingon, it was used in the phrase cha'vatlh ben HIq "two century old ale", which confused lots of klingonists.
MO: That's right, but this follows the same pattern, so it's clear you can use it for both meanings.
jIH qan law' SoH qan puS
I'm older than you
jIH Qup law' SoH Qup puS
I'm younger than you
cha' DISmo' jIH qan law' SoH qan puS
I'm two years older than you
You can also replace some of the components and say the following:
cha' 'ujmo' jIH woch law' SoH woch puS
I'm two 'ujes taller than you.