gistfile1.txt

import csv
import datetime

ld = '' # Input wanted LD

legdistrict = []
reader = csv.DictReader(open('active.txt', 'rb'), delimiter='\t')

for row in reader:
	if row['LegislativeDistrict'] == 'ld':
		legdistrict.append(row)

ages = []
	
for i,value in enumerate(legdistrict):
	dates = datetime.datetime.now() - datetime.datetime.strptime(value['Birthdate'], '%m/%d/%Y')
	ages.append(int(datetime.timedelta.total_seconds(dates) / 31556952))

total_values = len(ages)
average_age = sum(ages) / total_values

print average_age