Most HR and Hits by Decade (Live Ball Era)

Disclaimer: Not advocating anything with this.  Just providing the facts:

2010 - today: HR - Jose Bautista 140 / H - Miguel Cabrera 690
2000 - 2009: HR - Alex Rodriguez 435 / H - Ichiro Suzuki 2,030
1990 - 1999: HR - Mark McGwire 405 / H - Mark Grace 1,754
1980 - 1989: HR - Mike Schmidt (HOF) 313 / H - Robin Yount (HOF) 1,731
1970 - 1979: HR - Willie Stargell (HOF) 296 / H - Pete Rose 2,045
1960 - 1969: HR - Harmon Killebrew (HOF) 393 / H - Roberto Clemente (HOF) 1,877
1950 - 1959: HR - Duke Snider (HOF) 326 / H - Richie Ashburn (HOF) 1,875
1940 - 1949: HR - Ted Williams (HOF) 234 / H - Lou Boudreau (HOF) 1,578
1930 - 1939: HR - Jimmie Foxx (HOF) 415 / H - Paul Waner (HOF) 1,959
1920 - 1929: HR - Babe Ruth (HOF) 467 / H - Rogers Hornsby (HOF) 2,085

For full decade HR leaders, only Willie Stargell (475) and Duke Snider (407) are not in the 500 HR club.

For full decade Hits leaders, less than half (4/9) eventually joined the 3,000 Hit Club: Robin Yount, Pete Rose, Roberto Clemente, and Paul Waner.  Ichiro Suzuki has 2,671 career Hits as of today (2013 is his Age 39 season).  It will be close, as he is currently signed through 2014.  He'll definitely need to be picked up for 2015, if not 2016 as well, when he will be 42.

Most notable discrepancy from the list: 2nd behind Babe Ruth's 467 HR in the 1920s was Rogers Hornsby, with 250 homers in the decade.

Ted Williams also missed 3 full seasons in the 1940s (1943 - 1945), which were his Age 24-26 seasons.  He was already without a doubt the best hitter in baseball by 1941, and arguably by 1940, when he was only 21.

Source: baseball-reference.com's Play Index