What does G.A.R. mean ?

[MrTeeto]

I have seen some people use G.A.R.when it comes to ability scores like this for example

7 (7 base, -6 age, +6 G.A.R.) what does G.A.R mean sorry if it is an obvious question.

[Wonderstell]

Greater Age Resistance - High level spell that lasts for 24 hours and negates all age penalties.

One of the reasons why many GMs just doesn't play with age modifiers, since they're unfairly penalizing to martial characters and a boon to casters.