Call it a benefit of sticking with the game for over a year.
Seriously, don't consider playing cRPG a day job. You don't get paid for playing it, and you're certainly not getting a raise for doing the same 'job' for a long time.
OP is right, higher generations can retire quicker and quicker. OK, now the gap is smaller with the heirloom theft, but honestly: that thing was all well and good
once. If you want to keep the gap as small as it is now, you either have to nerf the generation bonus, or reduce the number of heirlooms
again and again - which is not nice.
normal xp 150% 250% xp
x1 1000 2500
x2 2000 5000
x3 3000 7500
x4 4000 10000
x5 5000 12500
it sure wont help them ...
Fixed that for you.