Numbers Across Generations

I came across a family of grandfather (GF), father (F), son (S) and sometime in future a grandchild (GS). 

An interesting observation was that the grandfather's last salary was about 1.5 times the father's starting salary. The father's last salary was about 1.5 times the son's starting salary.

Next Observation:

The grandfather's last salary was about 60 times his own starting salary. The father's last salary was about 60 times his own starting salary.

Gold was about Rs10/gm when grandfather started working. It was about Rs300/gm when father started working. It was about Rs3000/gm when son started working. Seems gold price is rising slowly now.

Finally: When grandfather started working one USD was about Rs 5, at the time father started working it was about Rs17, when son started working it was about Rs65 increasing 3.5 to 4 times each generation.

Assuming the same trend continues, one can predict the son's last salary at about 60 times his current salary. And three decades later the starting salary of the grandchild maybe about 60/1.5=40 times son's starting salary. These numbers sound astronomical. Maybe gold will be about Rs15,000/gm then. And one $ will fetch about Rs 250 at that time.

And how India be then? What will be the latest fad?