diff --git a/terminal_sunday.rb b/terminal_sunday.rb
index c756811..1f7821b 100755
--- a/terminal_sunday.rb
+++ b/terminal_sunday.rb
@@ -10,7 +10,36 @@
 
 birthdate = ARGV[0]
 name = ARGV.length > 1 ? ARGV[1] : ENV['USER']
-life_expectancy = 80
+
+LIFE_EXPECTANCY = [
+  # Via Statistics Canada https://www150.statcan.gc.ca/t1/tbl1/en/tv.action?pid=1310013401
+  [25, 80.2],
+  [30, 80.4],
+  [35, 80.6],
+  [40, 80.8],
+  [45, 81.1],
+  [50, 81.5],
+  [55, 82.0],
+  [60, 82.8],
+  [65, 83.8],
+  [70, 85.2],
+  [75, 86.9],
+  [80, 89.1],
+  [85, 91.8],
+  [90, 95.1]
+]
+def life_expectancy_at(age_in_years)
+  # Short-circuit outside census range
+  return 80 if age_in_years < 25
+  return age_in_years + 5 if age_in_years >= 90
+
+  # Otherwise linearly interpolate between steps
+  i = LIFE_EXPECTANCY.index { |age, expect| age <= age_in_years }
+  baseline = LIFE_EXPECTANCY[i][1]
+  step_progress = (age_in_years - LIFE_EXPECTANCY[i][0]) / 5.0
+  step_change = LIFE_EXPECTANCY[i+1][1] - LIFE_EXPECTANCY[i][1]
+  baseline + step_change * step_progress
+end
 
 begin
   birthdate_parsed = Date.parse(birthdate)
@@ -21,8 +50,10 @@
 
 current_date = Date.today
 weeks_passed = (current_date - birthdate_parsed).to_i / 7
+years_passed = weeks_passed / 52
+life_expectancy = life_expectancy_at(years_passed)
 total_weeks = life_expectancy * 52
-weeks_remaining = total_weeks - weeks_passed
+weeks_remaining = (total_weeks - weeks_passed).to_i
 birth_year = birthdate_parsed.year
 years_passed = (current_date.year - birth_year)
 last_year = birth_year + life_expectancy - 1
@@ -36,6 +67,6 @@
   line_break = (year_index == life_expectancy - 1) ? "\n" : "\n\n"
   print line_break if (year_index + 1) % 20 == 0
 end
-print " " * 55 + last_year.to_s
+print " " * 55 + last_year.to_i.to_s
 
 puts "\n\nHow are you going to spend these Sundays, #{name}?"