Depending on your reckoning of prime years, Sosa's came either after them or maybe a one-year overlap. Not remotely the same as Bagwell. Although there will never likely be any hard evidence against him, Sosa remains in limbo as the prototype of what a steroid-aided career looks like. He hit 66 @ age 29. 29 isn't a prime year? It's pre-30. Also, he hit 36 in just 144 games in '95, and then 40 in just 124 games in '96. Ages 26 and 27 are definitely prime years. He would have had over 50 HRs in '97 without the injury that ended his season early, at age 27, a prime year. I'd generally call 25-28 prime years for a hitter, but even if we stretch that to 29, waiting until the last year and then exploding to previously unthought of levels of production is not normal. OPS+ 25-33: 127, 121, 126, 99, 160, 151, 161, 203, 160. You can fiddle with counting numbers and might-have-beens all you want, but there is a clear line to be drawn there, it isn't at 26 or 27.