import csv as csv
import numpy as np

csv_file_object = csv.reader(open('test.csv', 'rb'))
header = csv_file_object.next()
data=[]
for row in csv_file_object:
    data.append(row)
data = np.array(data)

hr = data[0::,0].astype(np.float)
mime = data[0::,1].astype(np.float)
age = float(input("Enter your age (in years): "))

if age > 19 and age < 31:
    i = 0
    for row in hr:
        if mime.all() > 0.4 and hr.all() > 100:
            hr = hr + i
    avghr = hr / len(hr)
    print avghr
else:
    print ('Age not in range')

Enter your age (in years): 25
[ 7.14285714  7.21428571  7.28571429  7.35714286  7.42857143  7.5
  6.42857143  5.17357143  5.21428571  7.85714286  8.57142857  9.28571429
  5.15642857  5.19142857]