Sometimes I'm bored so I do things like this because I find them interesting. I pulled information from MLB's website to compare the success of each MLB franchise adjusted for how many years they have existed.

How often each team wins a pennant:
1. Yankees--2.78 years (40 in 111 years)
2. Dodgers--6.19 years (21 in 130 years)
3. Cardinals--6.95 years (19 in 132 years)
4. Athletics--7.53 years (15 in 113 years)
5. Braves--8.41 years (17 in 143 years)
6. Red Sox--8.69 years (13 in 113 years)
7. Giants--8.73 years (15 in 131 years)
8. Cubs--8.75 years (16 in 140 years)
9. Tigers--10.27 years (11 in 113 years)
10. Marlins--10.50 years (2 in 21 years)
11. Orioles--11.30 years (10 in 113 years)
12. Mets--13.00 years (4 in 52 years)
t13. Pirates--14.67 years (9 in 132 years)
t13. Reds--14.67 years (9 in 132 years)
15. Royals--15.00 years (3 in 45 years)
t16. Rays--16.00 years (1 in 16 years)
t16. Diamondbacks--16.00 years (1 in 16 years)
18. Blue Jays--18.50 years (2 in 37 years)
19. Phillies--18.71 years (7 in 131 years)
t20. Twins--18.83 years (6 in 113 years)
t20. White Sox--18.83 years (6 in 113 years)
22. Rockies--21 years (1 in 21 years)
23. Padres--22.50 years (2 in 45 years)
24. Indians--22.60 years (5 in 113 years)
25. Rangers--26.50 years (2 in 53 years)
26. Brewers--45.00 years (1 in 45 years)
27. Astros--52.00 years (1 in 52 years)
28. Angels--53.00 years (1 in 53 years)
t29. Mariners--No pennants
t29. Nationals--No pennants

How often each team wins a World Series:
1. Yankees--4.11 years (27 in 111 years)
2. Marlins--10.5 years (2 in 21 years)
3. Cardinals--12.00 years (11 in 132 years)
4. Athletics--12.56 years (9 in 113 years)
5. Red Sox--14.13 years (8 in 113 years)
6. Diamondbacks--16.00 years (1 in 16 years)
7. Giants--16.38 years (8 in 131 years)
8. Blue Jays--18.50 years (2 in 37 years)
9. Dodgers--21.67 years (6 in 130 years)
10. Mets--26.00 years (2 in 52 years)
t11. Reds--26.40 years (5 in 132 years)
t11. Pirates--26.40 years (5 in 132 years)
13. Tigers--28.25 years (4 in 113 years)
t14. Orioles--37.67 years (3 in 113 years)
t14. Twins--37.67 years (3 in 113 years)
t14. White Sox--37.67 years (3 in 113 years)
17. Royals--45.00 years (1 in 45 years)
18. Braves--47.67 years (3 in 143 years)
19. Angels--53.00 years (1 in 53 years)
20. Indians--56.50 years (2 in 113 years)
21. Phillies--65.50 years (2 in 131 years)
22. Cubs--70 years (2 in 140 years)
t23. Rays--No World Series titles
t23. Rockies--No World Series titles
t23. Mariners--No World Series titles
t23. Brewers--No World Series titles
t23. Nationals--No World Series titles
t23. Padres--No World Series titles
t23. Astros--No World Series titles
t23. Rangers--No World Series titles