I don't know about "well into" but it's definitely into its 5th decade (as am I, at 2 years older than TFA): 1st decade: 82-91 2nd decade: 92-01 3rd decade:

I don't know about "well into" but it's definitely into its 5th decade (as am I, at 2 years older than TFA): 1st decade: 82-91 2nd decade: 92-01 3rd decade: 02-11 4th decade: 12-21 5th decade: 22-31