1) When a customer is born, They become approximately linearly annoying untill they plateau at around age 40-50.
2) After around age 50, customers become too obese and lazy to complain so they gradually become "kinder" and more appreciative.
3) The phase of becomming more appreciative however reaches a minima at around 65-70 ish. as the appreciativeness gradually becomes annoying as they waste our time.
4) Afterwards, customers realise that they have wasted 70 years of their life and in an attempt to become more "hip" they recount "glorious" tales of their time to staff, effectively becomming more annoying than their "plateau" years.
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