Very reassuring information!
Just looking up some reference intervals for thyroid function tests. One lab certainly seems to think that thyroid doesn’t affect life expectancy:
Free T4
up to 6 days 11 to 32
up to 3 month 12 to 28
up to 1 year 12 to 26
up to 6 years 11 to 23
up to 11 years 12 to 22
up to 19 years 12 to 21
up to 128 years 12 to 22 pmol/L
gps.northcentrallondon.icb....