Are you referring to "The halls of MonteZUMA"?
I was just looking at older Pepsi slogans over the years
1985: Taste the difference Generation next
1989: A generation ahead
1992: Gotta have it
1993: Be young, Have fun, Drink Pepsi
1997: generation next
2006/2007: Why you doggin' me/ Taste the one that's forever young
Creepy to say the least. The next Generation is babies