Increasing Age Cap/Decreasing Age

[Jack_Trowell]

Empowering in death might allow you to cast twiceborn, useful to transforme an old mage with good path into a no-upkeep undeath.

But for a thug you would lose your base form so not so good.

[LDiCesare]

T'ien Ch'i (maybe only EA) also has a spell that removes a few years at the cost of 5% shattered soul or insanity (can't remember the specifics). Celestial masters can easilly cast it.

[chrispedersen]

Internal alchemy