Target heart rates are based on percentages of your maximum heart rate and since you max drops with age, the target must also drop since its the same percentage of a lower number. Heart rate is a sympathetic nervous system reaction to exercise and is therefore controlled by the subconscious brain. It drops with age due a complex subconscious process due to the central governor, a theory put forth by exercise scientist Tim Noakes.
220-your age=target heart rate (i think)
Yes... use this "formula" 220-your age = predicted maximum heart rate
(220 + your age) ×.55 = beats per minute
age
For a woman take the #226 and subtract your age. then figure 80% of that for an aerobic target heart rate. subtracting your age from the #226 gives your maximun heart rate when training your target heart rate will depend on what your work out goal is.
220 - age gives you your target heart rate.
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Target heart rate
nah 200bmp (vaires a bit with age)