Stats

Between 1961 and 1994, only 3 players passed the homerun mark of 50 in a season. In 1997, 13 different players hit at least 40 homeruns. During that year, Sammy Sosa hit 66 homeruns and Mark McGuire hit 70 homeruns. McGuire's homerun record only lasted for 3 years as Barry Bonds hit 73 in 2001.

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This article talks about how steroids prolonged peoples playing careers. This is huge when it comes to breaking records and being a valuable player for many years. https://sabr.org/journal/article/stats-and-studies-did-performance-enhancing-drugs-prolong-careers/