[Impy]

I also imagine that those over 65 would be exempt from paying the 9% sales tax.

"Hey granny, let's go shopping!!". ;)

[expat_panama]

"...imagine that those over 65 would be exempt from paying the 9% sales tax."

Imagination is fun but in real life we either see 9-9-9 as a confiscation of 9% of everyone's retirement savings, or we jury-rig it with as many loopholes as today's income tax.   Another real life fact is we'll get the sales tax added to the current taxes first, and then before any taxes get cut we'll be hearing about 10-10-10 and 20-20-20. 

A far better choice is spending cuts begining with the 2/3's for 'human resources' --AKA Endowment for Arts, NPR, and teaching Africans how to wash their penises.